diff --git a/pkgs/nix-tools/darwin-rebuild.sh b/pkgs/nix-tools/darwin-rebuild.sh
index 6e2817a..ea6c23f 100644
--- a/pkgs/nix-tools/darwin-rebuild.sh
+++ b/pkgs/nix-tools/darwin-rebuild.sh
@@ -28,7 +28,7 @@ showSyntax() {
   echo "                             [--no-update-lock-file] [--no-write-lock-file]" >&2
   echo "                             [--override-input input flake] [--update-input input]" >&2
   echo "                             [--no-registries] [--offline] [--refresh]]" >&2
-  echo "               [--substituters substituters-list] ..." >&2
+  echo "               [--substituters substituters-list] [--log-format log-format] ..." >&2
   exit 1
 }
 
@@ -128,7 +128,7 @@ while [ $# -gt 0 ]; do
       fi
       shift 1
       ;;
-    --substituters)
+    --substituters|--log-format)
       if [ -z "$1" ]; then
         echo "$0: '$i' requires an argument"
         exit 1