diff --git a/.gitlab/diff-comment-mr.sh b/.gitlab/diff-comment-mr.sh
index 8d734e2..2d40c91 100755
--- a/.gitlab/diff-comment-mr.sh
+++ b/.gitlab/diff-comment-mr.sh
@@ -7,6 +7,8 @@
 #
 # Usage: ./diff-comment-mr.sh 'doc/openapi.yml' my-doc my-bump-token-123
 #
+# Please make sure this file have execution rights (or you can run this command:
+# `chmod +x .gitlab/diff-comment-mr.sh` ).
 
 bump_preview() {
     npm exec -- bump preview "${1}"