diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1be52b0b4..d9d69adfe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ IMPROVEMENTS:
 - guests/debian: Adjust network configuration file prefix to 50- [GH-9646]
 - guests/photon: Less specific string grep to fix PhotonOS 2.0 detection [GH-9528]
 - guests/windows: Fix slow timeout when updating windows hostname [GH-9578]
+- util/platform: Warn on ArgumentError exceptions from encoding [GH-9506]
 
 BUG FIXES: