diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index 4e389c8692..60af31cca7 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -13,7 +13,7 @@ module ActiveModel
# * include ActiveModel::Dirty in your object.
# * Call define_attribute_methods passing each method you want to
# track.
- # * Call attr_name_will_change! before each change to the tracked
+ # * Call [attr_name]_will_change! before each change to the tracked
# attribute.
# * Call changes_applied after the changes are persisted.
# * Call clear_changes_information when you want to reset the changes