diff --git a/nixos/doc/manual/release-notes/rl-2311.section.md b/nixos/doc/manual/release-notes/rl-2311.section.md
index 3e4f2cf69517..8c56fe57a7f6 100644
--- a/nixos/doc/manual/release-notes/rl-2311.section.md
+++ b/nixos/doc/manual/release-notes/rl-2311.section.md
@@ -28,6 +28,10 @@
   - `root` and `wheel` are not given the ability to set (or preserve)
     arbitrary environment variables.
 
+  **Note:** The `sudo-rs` module only takes configuration through `security.sudo-rs`,
+  and in particular does not automatically use previously-set rules; this could be
+  achieved with `security.sudo-rs.extraRules = security.sudo.extraRules;` for instance.
+
 [`sudo-rs`]: https://github.com/memorysafety/sudo-rs/
 
 - [glibc](https://www.gnu.org/software/libc/) has been updated from version 2.37 to 2.38, see [the release notes](https://sourceware.org/glibc/wiki/Release/2.38) for what was changed.