diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md
index 4f3c9ce41..8c8c0fd41 100644
--- a/doc/manual/src/release-notes/rl-next.md
+++ b/doc/manual/src/release-notes/rl-next.md
@@ -32,3 +32,11 @@
   paths. Like fixed-output derivations, impure derivations have access
   to the network. Only fixed-output derivations and impure derivations
   can depend on an impure derivation.
+
+* The `nixosModule` flake output attribute has been renamed consistent
+  with the `.default` renames in nix 2.7.
+
+  * `nixosModule` → `nixosModules.default`
+
+  As before, the old output will continue to work, but `nix flake check` will
+  issue a warning about it.