diff --git a/xml/sample-registration-with-encryption.xml b/xml/sample-registration-with-encryption.xml
index 18f26dc..48e8eee 100644
--- a/xml/sample-registration-with-encryption.xml
+++ b/xml/sample-registration-with-encryption.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<push-register xmlns="https://bitfire.at/webdav-push">
+<push-register xmlns="https://bitfire.at/webdav-push" xmlns:d="DAV:">
   <subscription>
     <web-push-subscription>
       <push-resource>https://up.example.net/yohd4yai5Phiz1wi</push-resource>
@@ -7,6 +7,11 @@
       <auth-secret>BTBZMqHH6r4Tts7J_aSIgg</auth-secret>
     </web-push-subscription>
   </subscription>
+  <trigger>
+    <content-update>
+      <d:sync-level>1</d:sync-level>
+    </content-update>
+  </trigger>
   <expires>Wed, 20 Dec 2023 10:03:31 GMT</expires>
 </push-register>