diff --git a/com.unity.ml-agents/CHANGELOG.md b/com.unity.ml-agents/CHANGELOG.md
index adf49c4b94..27835b1ecc 100755
--- a/com.unity.ml-agents/CHANGELOG.md
+++ b/com.unity.ml-agents/CHANGELOG.md
@@ -85,6 +85,7 @@ or actuators on your system. (#5194)
 
 #### ml-agents / ml-agents-envs / gym-unity (Python)
 - Fixed a bug where --results-dir has no effect. (#5269)
+- Fixed a bug where old `.pt` checkpoints were not deleted during training. (#5271)
 
 ## [1.9.1-preview] - 2021-04-13
 ### Major Changes