diff --git a/xep-0087.xml b/xep-0087.xml
index 8b4f328c..0d99e714 100644
--- a/xep-0087.xml
+++ b/xep-0087.xml
@@ -23,6 +23,12 @@
     <email>temas@jabber.org</email>
     <jid>temas@jabber.org</jid>
   </author>
+  <revision>
+    <version>0.1.1</version>
+    <date>2022-03-22</date>
+    <initials>gl</initials>
+    <remark>Fix incorrect URL to SI namespace.</remark>
+  </revision>
   <revision>
     <version>0.1</version>
     <date>2003-05-22</date>
@@ -206,7 +212,7 @@
     <![CDATA[
     <iq type='result' to='sender@jabber.org/resource' id='offer1'>
       <si
-        xmlns='http://jabber.org/si'
+        xmlns='http://jabber.org/protocol/si'
         id='a0'>
         <feature xmlns='http://jabber.org/protocol/feature-neg'>
           <x xmlns='jabber:x:data' type='submit'>