diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index c0fc50728678235e3d52257f9bf0890a358454dc..0169c20e0b3b20b25b681ae0cd04b567d19e85cb 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -102,10 +102,10 @@ module ActiveModel
# person.changes # => {"name" => ["Bill", "Bob"]}
#
# If an attribute is modified in-place then make use of
- # +[attribute_name]_will_change!+ to mark that the attribute is changing.
+ # [attribute_name]_will_change! to mark that the attribute is changing.
# Otherwise \Active \Model can't track changes to in-place attributes. Note
# that Active Record can detect in-place modifications automatically. You do
- # not need to call +[attribute_name]_will_change!+ on Active Record models.
+ # not need to call [attribute_name]_will_change! on Active Record models.
#
# person.name_will_change!
# person.name_change # => ["Bill", "Bill"]