diff --git a/pkgs/desktops/pantheon/apps/appcenter/default.nix b/pkgs/desktops/pantheon/apps/appcenter/default.nix
index 7ee81df4b462..bf99163a5414 100644
--- a/pkgs/desktops/pantheon/apps/appcenter/default.nix
+++ b/pkgs/desktops/pantheon/apps/appcenter/default.nix
@@ -31,6 +31,7 @@ stdenv.mkDerivation rec {
     repo = pname;
     # Add support for AppStream 1.0.
     # https://github.com/elementary/appcenter/pull/2099
+    # nixpkgs-update: no auto update
     rev = "fce55d9373bfb82953191b32e276a2129ffcb8c1";
     hash = "sha256-7VYiE1RkaqN1Yg4pFUBs6k8QjoljYFDgQ9jCTLG3uyk=";
   };
diff --git a/pkgs/desktops/pantheon/desktop/elementary-session-settings/default.nix b/pkgs/desktops/pantheon/desktop/elementary-session-settings/default.nix
index d1d2b6533e93..dff4189a1a2d 100644
--- a/pkgs/desktops/pantheon/desktop/elementary-session-settings/default.nix
+++ b/pkgs/desktops/pantheon/desktop/elementary-session-settings/default.nix
@@ -96,6 +96,9 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "elementary";
     repo = "session-settings";
+    # For systemd managed gnome-session support.
+    # https://github.com/NixOS/nixpkgs/issues/228946
+    # nixpkgs-update: no auto update
     rev = "3476c89bbb66564a72c6495ac0c61f8f9ed7a3ec";
     sha256 = "sha256-Z1qW6m0XDkB92ZZVKx98JOMXiBDbGpQ0cAXgWdqK27c=";
   };