diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index 4f120d4b4555734a8a85b6b9c09e32374caf0c1f..3a4ae6cb8ba62a9e1d34940ed29ee9bb2dc79bbe 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -1,5 +1,5 @@
 module Enumerable
-  # Enumerable#sum was added in Ruby 2.4 but it only works with Numeric elements
+  # Enumerable#sum was added in Ruby 2.4, but it only works with Numeric elements
   # when we omit an identity.
   #
   # We tried shimming it to attempt the fast native method, rescue TypeError,