diff --git a/activerecord/lib/active_record/properties.rb b/activerecord/lib/active_record/properties.rb
index e70f84808dd57990a786694725716b636b32e929..5fd51e09fac76ad1b88e75845b25b7f188cc3f44 100644
--- a/activerecord/lib/active_record/properties.rb
+++ b/activerecord/lib/active_record/properties.rb
@@ -5,7 +5,7 @@ module Properties # :nodoc:
     Type = ActiveRecord::Type
 
     included do
-      class_attribute :user_provided_columns, instance_accessor: false # :internal
+      class_attribute :user_provided_columns, instance_accessor: false # :internal:
       self.user_provided_columns = {}
     end