diff --git a/release-notes/Cabal-3.10.2.1.md b/release-notes/Cabal-3.10.2.1.md
new file mode 100644
index 00000000000..bfa8fa750b5
--- /dev/null
+++ b/release-notes/Cabal-3.10.2.1.md
@@ -0,0 +1,9 @@
+Cabal and Cabal-syntax 3.10.2.1 changelog and release notes
+---
+
+## Release 3.10.2.1 is strictly a bug-fix release, with the fixes listed below
+
+- Relax extension .c requirement for c-sources [#9285](https://github.com/haskell/cabal/pull/9285)
+
+We will be tightening the behaviour of Cabal in the future, when users list files ending with extensions other than `.c` in the `c-sources` field of their cabal file. These files were never processed properly.
+This PR displays more warnings and prepares the transition.