diff --git a/CHANGES.md b/CHANGES.md
index e1bd10689..1968415bd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,11 @@
 
 ## __NEXT__
 
+### Bug Fixes
+
+* frequencies: Previously, monthly pivot points calculated from the end of a month may have been shifted by 1-3 days. This is now fixed. [#1150][] (@victorlin)
+
+[#1150]: https://github.com/nextstrain/augur/pull/1150
 
 ## 21.0.0 (7 February 2023)