diff --git a/example-dns-01-nsupdate-script.md b/example-dns-01-nsupdate-script.md
index 2a68fc5..13df2fb 100644
--- a/example-dns-01-nsupdate-script.md
+++ b/example-dns-01-nsupdate-script.md
@@ -33,9 +33,14 @@ case "$1" in
     "unchanged_cert")
         # do nothing for now
         ;;
+    "startup_hook")
+        # do nothing for now
+        ;;
+    "exit_hook")
+        # do nothing for now
+        ;;
     *)
-        echo Unknown hook "${1}"
-        exit 1
+        echo "Warning: Unknown hook '$1'"
         ;;
 esac