diff --git a/xep-0363.xml b/xep-0363.xml
index 37985292..7135c503 100644
--- a/xep-0363.xml
+++ b/xep-0363.xml
@@ -249,7 +249,7 @@
 </iq>]]></example>
 </section1>
 <section1 topic='Requesting a slot' anchor='request'>
-  <p>A client requests a new upload slot by sending an IQ-get to the upload service containing a &lt;request&gt; child element qualified by the urn:xmpp:http:upload:0 namespace. This element MUST include the attributes filename and size containing the file name and size respectively.</p>
+  <p>A client requests a new upload slot by sending an IQ-get to the upload service containing a &lt;request&gt; child element qualified by the urn:xmpp:http:upload:0 namespace. This element MUST include the attributes filename and size containing the file name and size (in bytes) respectively.</p>
   <p>An additional attribute content-type containing the Content-Type is OPTIONAL.</p>
   <example caption='Client requests a slot on the upload service'><![CDATA[
 <iq from='romeo@montague.tld/garden'