diff --git a/csharp/ql/lib/change-notes/2026-02-05-extension-types.md b/csharp/ql/lib/change-notes/2026-02-05-extension-types.md
new file mode 100644
index 00000000000..c3f1a21a5ed
--- /dev/null
+++ b/csharp/ql/lib/change-notes/2026-02-05-extension-types.md
@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* C# 14: Added support for `extension` members in the extractor, QL library, data flow, and Models as Data, covering extension methods, properties, and operators.