diff --git a/docs/release-notes/0.10.6.md b/docs/release-notes/0.10.6.md
index 4a978f4dd..052523979 100644
--- a/docs/release-notes/0.10.6.md
+++ b/docs/release-notes/0.10.6.md
@@ -4,6 +4,7 @@
 ```
 
 * Defer import of zarr in test helpers, as scanpy CI job relies on them {pr}`1343` {user}`ilan-gold`
+* Writing a dataframe with non-unique column names now throws an error, instead of silently overwriting {pr}`1335` {user}`ivirshup`
 
 ```{rubric} Documentation
 ```