diff --git a/doc/release-notes/rl-2511.section.md b/doc/release-notes/rl-2511.section.md
index 1d32eabf6ea8..21ffab0b5009 100644
--- a/doc/release-notes/rl-2511.section.md
+++ b/doc/release-notes/rl-2511.section.md
@@ -16,6 +16,11 @@
   If a newer C++ library feature is not available on the default deployment target, you will need to increase the deployment target.
   See the Darwin platform documentation for more details.
 
+- **This release of Nixpkgs requires macOS Sonoma 14.0 or newer, as announced in the 25.05 release notes.**
+  The default SDK is now 14.4, but the minimum version is 14.0.
+  cc-wrapper will enforce that availability annotations are used or an appropriate deployment target is set.
+  See the Darwin platform notes for details.
+
 - LLVM has been updated from 19 to 21.
 
 ## Backward Incompatibilities {#sec-nixpkgs-release-25.11-incompatibilities}