diff --git a/History.markdown b/History.markdown
index d871a5917f5..f5e9b6d4472 100644
--- a/History.markdown
+++ b/History.markdown
@@ -3,6 +3,7 @@
 ### Development Fixes
 
   * CI: Test against Ruby 2.5.0 (#6664)
+  * Bump rdoc to 6.0 (#6600)
 
 ### Site Enhancements