diff --git a/docs/examples/hook.sh b/docs/examples/hook.sh
index 7107580..b7bd836 100755
--- a/docs/examples/hook.sh
+++ b/docs/examples/hook.sh
@@ -113,4 +113,6 @@ exit_hook() {
 }
 
 HANDLER="$1"; shift
-"$HANDLER" "$@"
+if [[ "${HANDLER}" =~ ^(deploy_challenge|clean_challenge|deploy_cert|unchanged_cert|invalid_challenge|request_failure|exit_hook)$ ]]; then
+  "$HANDLER" "$@"
+fi