diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index d7a71014045bc..f588475bbf530 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -856,7 +856,8 @@ def arel_engine
       #     limit(10) # Fires "SELECT * FROM posts LIMIT 10"
       #   }
       #
-      # Assuming that <tt>published</tt> is a <tt>named_scope</tt> following two statements are same.
+      # It is recommended to use block form of unscoped because chaining unscoped with <tt>named_scope</tt>
+      # does not work. Assuming that <tt>published</tt> is a <tt>named_scope</tt> following two statements are same.
       #
       # Post.unscoped.published
       # Post.published