diff --git a/tag.sh b/tag.sh
index 6c25e20..7304243 100755
--- a/tag.sh
+++ b/tag.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 set -ueo pipefail
+[ "${DEBUG:-0}" = "1" ] && set -x
 # usage:
 #   - init - create an empty database
 #   - import - import $FILE or import $DIR, both can be multiple values