diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Crosssell.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Crosssell.php
index ba7b9b5fcb593..bc51a0f44be0d 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Crosssell.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Crosssell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class Crosssell
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class Crosssell extends \Magento\Catalog\Controller\Adminhtml\Product\Crosssell
 {
 }
diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/CrosssellGrid.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/CrosssellGrid.php
index 87550d768ca8e..18668b6be4dcd 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/CrosssellGrid.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/CrosssellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class CrosssellGrid
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class CrosssellGrid extends \Magento\Catalog\Controller\Adminhtml\Product\CrosssellGrid
 {
 }
diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Related.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Related.php
index 58f464fba3afe..f17031e30f9b7 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Related.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Related.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class Related
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class Related extends \Magento\Catalog\Controller\Adminhtml\Product\Related
 {
 }
diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/RelatedGrid.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/RelatedGrid.php
index a27efe8bc2b68..01cd7705c02d6 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/RelatedGrid.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/RelatedGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class RelatedGrid
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class RelatedGrid extends \Magento\Catalog\Controller\Adminhtml\Product\RelatedGrid
 {
 }
diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Upsell.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Upsell.php
index d0a6343569ee8..6bbf55862cf24 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Upsell.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/Upsell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class Upsell
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class Upsell extends \Magento\Catalog\Controller\Adminhtml\Product\Upsell
 {
 }
diff --git a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/UpsellGrid.php b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/UpsellGrid.php
index 74c87be5b7108..ed3312d3b0734 100644
--- a/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/UpsellGrid.php
+++ b/app/code/Magento/Bundle/Controller/Adminhtml/Bundle/Product/Edit/UpsellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit;
 
+/**
+ * Class UpsellGrid
+ *
+ * @package Magento\Bundle\Controller\Adminhtml\Bundle\Product\Edit
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class UpsellGrid extends \Magento\Catalog\Controller\Adminhtml\Product\UpsellGrid
 {
 }
diff --git a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Crosssell.php b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Crosssell.php
index e4f700e5790a2..0d4a3c0da5943 100644
--- a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Crosssell.php
+++ b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Crosssell.php
@@ -13,6 +13,8 @@
  * @api
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  * @since 100.0.2
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see \Magento\Catalog\Ui\DataProvider\Product\Related\CrossSellDataProvider
  */
 class Crosssell extends Extended
 {
diff --git a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Related.php b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Related.php
index 0c59a7402dac1..5063d920c9109 100644
--- a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Related.php
+++ b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Related.php
@@ -11,6 +11,8 @@
 /**
  * @api
  * @since 100.0.2
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see \Magento\Catalog\Ui\DataProvider\Product\Related\RelatedDataProvider
  */
 class Related extends Extended
 {
diff --git a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Upsell.php b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Upsell.php
index 323b1785bc96e..51136acfe990b 100644
--- a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Upsell.php
+++ b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Upsell.php
@@ -8,6 +8,8 @@
 /**
  * @api
  * @since 100.0.2
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see \Magento\Catalog\Ui\DataProvider\Product\Related\CrossSellDataProvider
  */
 class Upsell extends \Magento\Backend\Block\Widget\Grid\Extended
 {
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Crosssell.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Crosssell.php
index fa94a2fb7be2c..ab60dd1f4a72a 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Crosssell.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Crosssell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class Crosssell
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class Crosssell extends \Magento\Catalog\Controller\Adminhtml\Product
 {
     /**
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/CrosssellGrid.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/CrosssellGrid.php
index daaf2c21ee2b9..4b573d26f97cf 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/CrosssellGrid.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/CrosssellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class CrosssellGrid
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class CrosssellGrid extends \Magento\Catalog\Controller\Adminhtml\Product
 {
     /**
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Related.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Related.php
index 4bc15d14a29b1..2348b84182623 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Related.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Related.php
@@ -7,6 +7,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class Related
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class Related extends \Magento\Catalog\Controller\Adminhtml\Product
 {
     /**
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/RelatedGrid.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/RelatedGrid.php
index b2fc7ebe1eb31..af69402e3f740 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/RelatedGrid.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/RelatedGrid.php
@@ -7,6 +7,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class RelatedGrid
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class RelatedGrid extends Related
 {
 }
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Upsell.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Upsell.php
index 614bddd0ebc87..858f12dde7bbc 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/Upsell.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/Upsell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class Upsell
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class Upsell extends \Magento\Catalog\Controller\Adminhtml\Product
 {
     /**
diff --git a/app/code/Magento/Catalog/Controller/Adminhtml/Product/UpsellGrid.php b/app/code/Magento/Catalog/Controller/Adminhtml/Product/UpsellGrid.php
index 50beb588b15df..7631fc592d21c 100644
--- a/app/code/Magento/Catalog/Controller/Adminhtml/Product/UpsellGrid.php
+++ b/app/code/Magento/Catalog/Controller/Adminhtml/Product/UpsellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Catalog\Controller\Adminhtml\Product;
 
+/**
+ * Class UpsellGrid
+ *
+ * @package Magento\Catalog\Controller\Adminhtml\Product
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class UpsellGrid extends \Magento\Catalog\Controller\Adminhtml\Product
 {
     /**
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssell.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssell.xml
index 4a27158be5f7c..d7aa058a1f446 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssell.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssell.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since cross-sell products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Crosssell" name="catalog.product.edit.tab.crosssell"/>
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssellgrid.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssellgrid.xml
index b5efecf0d03c2..3ba4562c9d3df 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssellgrid.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_crosssellgrid.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since cross-sell products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Crosssell" name="catalog.product.edit.tab.crosssell"/>
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_related.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_related.xml
index 1340d40ef4f9f..c40c4a2818efa 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_related.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_related.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since related products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Related" name="catalog.product.edit.tab.related"/>
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_relatedgrid.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_relatedgrid.xml
index 1ae83419ae646..38b791d88a00d 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_relatedgrid.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_relatedgrid.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since related products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Related" name="catalog.product.edit.tab.related"/>
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsell.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsell.xml
index a9770ed3c182e..eea4450411945 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsell.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsell.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since upsell products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Upsell" name="catalog.product.edit.tab.upsell"/>
diff --git a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsellgrid.xml b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsellgrid.xml
index a4acf572caeb5..2c400746c64f2 100644
--- a/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsellgrid.xml
+++ b/app/code/Magento/Catalog/view/adminhtml/layout/catalog_product_upsellgrid.xml
@@ -5,6 +5,10 @@
  * See COPYING.txt for license details.
  */
 -->
+<!--
+@deprecated Not used since upsell products grid moved to UI components.
+@see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+-->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root" label="Root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Upsell" name="catalog.product.edit.tab.upsell"/>
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Crosssell.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Crosssell.php
index e7b1fff27680e..bd5229f4b7077 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Crosssell.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Crosssell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class Crosssell
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class Crosssell extends \Magento\Catalog\Controller\Adminhtml\Product\Crosssell
 {
 }
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/CrosssellGrid.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/CrosssellGrid.php
index 8a77cb2c01011..5fc6ea0e6c7cb 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/CrosssellGrid.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/CrosssellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class CrosssellGrid
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since cross-sell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/crosssell_product_listing.xml
+ */
 class CrosssellGrid extends \Magento\Catalog\Controller\Adminhtml\Product\CrosssellGrid
 {
 }
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Related.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Related.php
index 8c10377f74e83..4ec043ca0b442 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Related.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Related.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class Related
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class Related extends \Magento\Catalog\Controller\Adminhtml\Product\Related
 {
 }
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/RelatedGrid.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/RelatedGrid.php
index 403b3828e39a0..796c97b183b21 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/RelatedGrid.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/RelatedGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class RelatedGrid
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since related products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/related_product_listing.xml
+ */
 class RelatedGrid extends \Magento\Catalog\Controller\Adminhtml\Product\RelatedGrid
 {
 }
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Upsell.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Upsell.php
index d712a7ec80d18..653a104d18b23 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Upsell.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/Upsell.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class Upsell
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class Upsell extends \Magento\Catalog\Controller\Adminhtml\Product\Upsell
 {
 }
diff --git a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/UpsellGrid.php b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/UpsellGrid.php
index 960909ca1b399..a9717e45f0398 100644
--- a/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/UpsellGrid.php
+++ b/app/code/Magento/Downloadable/Controller/Adminhtml/Downloadable/Product/Edit/UpsellGrid.php
@@ -6,6 +6,13 @@
  */
 namespace Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit;
 
+/**
+ * Class UpsellGrid
+ *
+ * @package Magento\Downloadable\Controller\Adminhtml\Downloadable\Product\Edit
+ * @deprecated Not used since upsell products grid moved to UI components.
+ * @see Magento_Catalog::view/adminhtml/ui_component/upsell_product_listing.xml
+ */
 class UpsellGrid extends \Magento\Catalog\Controller\Adminhtml\Product\UpsellGrid
 {
 }