diff --git a/doc/release-notes/rl-2605.section.md b/doc/release-notes/rl-2605.section.md
index a66e6abcd87a..85fb2cac10eb 100644
--- a/doc/release-notes/rl-2605.section.md
+++ b/doc/release-notes/rl-2605.section.md
@@ -216,6 +216,8 @@
 - `light` has been removed because it was unmaintained.
   `brightnessctl` and `acpilight` provide similar functionality.
 
+- `opensmtpd-filter-dkimsign` is now installed into `libexec/smtpd` instead of `libexec/opensmtpd` so that now it is properly linked into the environment built by `services.opensmtpd.procPackages`. If you hardcoded path to `filter-dkimsign` please consider using this option.
+
 - `services.openssh.settings.AcceptEnv` now explicitly defined as an option that takes a list of strings, to facilitate option merging. Setting it to a string value is no longer supported.
 
 - All Xfce packages have been moved to top level (e.g. if you previously added `pkgs.xfce.xfce4-whiskermenu-plugin` to `environment.systemPackages`, you will need to change it to `pkgs.xfce4-whiskermenu-plugin`). The `xfce` scope will be removed in NixOS 26.11.