diff --git a/pkgs/servers/mail/opensmtpd/default.nix b/pkgs/servers/mail/opensmtpd/default.nix
index 4d6c915f359..6730f7acc67 100644
--- a/pkgs/servers/mail/opensmtpd/default.nix
+++ b/pkgs/servers/mail/opensmtpd/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   };
 
   patches = [
-    ./proc_path.diff
+    ./proc_path.diff # TODO: upstream to OpenSMTPD, see https://github.com/NixOS/nixpkgs/issues/54045
   ];
 
   # See https://github.com/OpenSMTPD/OpenSMTPD/issues/885 for the `sh bootstrap`