diff --git a/docs/changelog.md b/docs/changelog.md
index 9f6a1c4e3e..cbae1be090 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -24,6 +24,9 @@ what we publish.
 
 ### Tooling changes
 
+- mblack (aka `mojo format`) no longer formats non-mojo files. This prevents
+  unexpected formatting of python files.
+
 ### ❌ Removed
 
 ### 🛠️ Fixed