diff --git a/doc/development/database/not_null_constraints.md b/doc/development/database/not_null_constraints.md
index b46326fe76c3e36708992754b0b50fbe484589db..33a21b712251a61119c887ba4763f2bf9f39c049 100644
--- a/doc/development/database/not_null_constraints.md
+++ b/doc/development/database/not_null_constraints.md
@@ -575,7 +575,7 @@ class DropNotNullConstraintFromLabelsProjectsLimit < Gitlab::Database::Migration
   end
 
   def down
-    change_column_null :labels, :projects_limit, false
+    add_not_null_constraint :labels, :projects_limit
   end
 end
 ```