diff --git a/lib/web/css/docs/source/_responsive.less b/lib/web/css/docs/source/_responsive.less
index 46c19bc23a66c..8e7397d6ad6f3 100644
--- a/lib/web/css/docs/source/_responsive.less
+++ b/lib/web/css/docs/source/_responsive.less
@@ -81,7 +81,7 @@
 //
 //  ## Gathering
 //
-//  Everything that you include in collector mixins above will go in place where they declarated.
+//  Everything that you include in collector mixins above will go in place where they declared.
 //  As example all
 //  ```css
 //  .media-width(@extremum, @break) {