diff --git a/Utils/change.sh b/Utils/change.sh
new file mode 100755
index 00000000..26e03cb2
--- /dev/null
+++ b/Utils/change.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+BASEDIR=$(dirname "$0")
+$BASEDIR/gyb --line-directive '' -o $BASEDIR/../Source/Device.generated.swift $BASEDIR/../Source/Device.swift.gyb
diff --git a/Utils/watch.sh b/Utils/watch.sh
new file mode 100755
index 00000000..e8a7224c
--- /dev/null
+++ b/Utils/watch.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+BASEDIR=$(dirname "$0")
+
+# brew install fswatch
+fswatch $BASEDIR/../Source/Device.swift.gyb | xargs -n1 -I{} $BASEDIR/change.sh