diff --git a/xep-0050.xml b/xep-0050.xml
index d9f2e07e..c8be61ec 100644
--- a/xep-0050.xml
+++ b/xep-0050.xml
@@ -25,6 +25,12 @@
     <url>http://www.xmpp.org/schemas/commands.xsd</url>
   </schemaloc>
   &linuxwolf;
+  <revision>
+    <version>1.2.2</version>
+    <date>2016-12-03</date>
+    <initials>XEP Editor (ssw, fs)</initials>
+    <remark>Mark 'note' element's 'type' attribute as optional in the schema. Introduce 'Acknowledgements' section.</remark>
+  </revision>
   <revision>
     <version>1.2.1</version>
     <date>2015-10-15</date>
@@ -990,4 +996,10 @@ xmpp:montague.net?command;node=stats
 </xs:schema>
   ]]></code>
 </section1>
+
+<section1 topic='Acknowledgements' anchor='acks'>
+  <p>Many thanks to Florian Schmaus, Christian Schudt and Anno van Vliet
+  for their input and feedback on this specification.</p>
+</section1>
+
 </xep>