diff --git a/History.markdown b/History.markdown
index dd181cba..368c0753 100644
--- a/History.markdown
+++ b/History.markdown
@@ -29,6 +29,7 @@
   * clean unit-test names in `test/test_tags.rb` (#5608)
   * Add cucumber feature to test for bonafide theme gems (#5384)
   * Use `assert_nil` instead of `assert_equal nil` (#5652)
+  * Rubocop -a on lib/jekyll (#5666)
 
 ### Documentation