diff --git a/History.markdown b/History.markdown
index 942d6763..1706488a 100644
--- a/History.markdown
+++ b/History.markdown
@@ -4,6 +4,7 @@
 
   * Stop testing with Ruby 2.0.x, which is EOL'd. (#4381)
   * Allow collections to have documents that have no file extension (#4545)
+  * Add size property to group_by result (#4557)
 
 ### Bug Fixes