diff --git a/source/reference/object-id.txt b/source/reference/object-id.txt
index 4a24437e4b0..41bfc0a469e 100644
--- a/source/reference/object-id.txt
+++ b/source/reference/object-id.txt
@@ -1,3 +1,5 @@
+.. _object-id:
+
 ========
 ObjectId
 ========