diff --git a/lib/rubocop/cop/rails/pluralization_grammar.rb b/lib/rubocop/cop/rails/pluralization_grammar.rb
index beaaa8d736..4ee227b486 100644
--- a/lib/rubocop/cop/rails/pluralization_grammar.rb
+++ b/lib/rubocop/cop/rails/pluralization_grammar.rb
@@ -11,7 +11,7 @@ module Rails
       #   3.day.ago
       #   1.months.ago
       #   5.megabyte
-      #   1.gigabyte
+      #   1.gigabytes
       #
       #   # good
       #   3.days.ago