diff --git a/deploy.sh b/deploy.sh
index d87f3ce..5397155 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -1,5 +1,10 @@
 #!/usr/bin/env bash
 
+if [ "$#" -lt 2 ]; then
+  echo "Usage: $0 <limit> <playbook> [playbook...]"
+  exit
+fi
+
 LIMIT=""
 LIMIT_PRESENT=$(echo "$1" | grep ".yml")
 if [ "${LIMIT_PRESENT}" == "" ]; then