diff --git a/script/format b/script/format
new file mode 100755
index 00000000..842b9c3a
--- /dev/null
+++ b/script/format
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+FILES_TO_FORMAT="atst/ tests/ app.py"
+
+if [ $1 == "check" ]; then
+  black --check -q ${FILES_TO_FORMAT}
+else
+  black ${FILES_TO_FORMAT}
+fi