diff --git a/draw.sh b/draw.sh
index 7908c48..2a53ab9 100644
--- a/draw.sh
+++ b/draw.sh
@@ -1,6 +1,9 @@
 #!/bin/bash
 
-#field guide
+if [[ "${1}" == "" ]]; then
+	echo "Please provide a directory as the first argument"
+	exit 1
+fi
 
 if [ "${2}" == "" ]; then
 	name=`basename "${1}"`