diff --git a/sample-env b/sample-env
index b183ab5..502e53f 100644
--- a/sample-env
+++ b/sample-env
@@ -3,5 +3,6 @@ COMMENT_ACTOR=username
 COMMENT_BODY_REGEXP=build failed
 COMMENT_BODY_REGEXP_FLAGS=i
 PULL_LABEL_FILTER=
+PULL_LABEL_EXCLUDE=
 PULL_AUTHOR_FILTER=
 PULL_RETEST_BODY=retest