diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index b53929c2a3d1da1bcbb7939595f3e3e6978c30d1..af7539881ac49785b48ebea25bd636078a10239e 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -24,6 +24,7 @@ def html_escape(s)
       end
     end
 
+    # Aliasing twice issues a warning "dicarding old...". Remove first to avoid it.
     remove_method(:h)
     alias h html_escape