diff --git a/xep-0363.xml b/xep-0363.xml
index 149b0949..e959f463 100644
--- a/xep-0363.xml
+++ b/xep-0363.xml
@@ -16,8 +16,8 @@
The upload service responds with both a PUT and a GET URL wrapped by a <slot> element. The service SHOULD keep the file name and especially the file ending intact. Using the same hostname for PUT and GET is OPTIONAL. The host SHOULD provide Transport Layer Security.
+The upload service responds with both a PUT and a GET URL wrapped by a <slot> element. The service SHOULD keep the file name and especially the file ending intact. Using the same hostname for PUT and GET is OPTIONAL. The host SHOULD provide Transport Layer Security (&rfc5256;).