diff --git a/pkgs/liminix-tools/builder.sh b/pkgs/liminix-tools/builder.sh
index fd2f8976..f113c91e 100644
--- a/pkgs/liminix-tools/builder.sh
+++ b/pkgs/liminix-tools/builder.sh
@@ -11,6 +11,7 @@ test -n "$contents" && for d in $contents; do
     touch $out/${name}/contents.d/$d
 done
 test -n "$run" && (echo -e "#!$shell\n$run" > $out/${name}/run)
+test -n "${notificationFd}" && (echo ${notificationFd} > $out/${name}/notification-fd)
 test -n "$up" && (echo -e "#!$shell\n$up" > $out/${name}/up)
 test -n "$down" && (echo -e "#!$shell\n$down" > $out/${name}/down)
 for i in $out/${name}/{down,up,run} ; do test -f $i && chmod +x $i; done
diff --git a/pkgs/liminix-tools/default.nix b/pkgs/liminix-tools/default.nix
index 366fbb2c..732f554f 100644
--- a/pkgs/liminix-tools/default.nix
+++ b/pkgs/liminix-tools/default.nix
@@ -11,6 +11,7 @@
     name
     , run
     , outputs ? []
+    , notification-fd ? null
     , dependencies ? []
   } @ args: stdenvNoCC.mkDerivation {
     name = "${name}.service";
@@ -19,6 +20,7 @@
     dependencies = builtins.map (d: d.name) dependencies;
     shell = "${busybox}/bin/sh";
     inherit run;
+    notificationFd = notification-fd;
     builder = ./builder.sh;
   };
   oneshot = {