Announce maximum file size by means of &xep0128;
An entity advertises support for this protocol by including the "urn:xmpp:http:upload" in its service discovery information features as specified in &xep0030; or section 6.3 of &xep0115;. A users server SHOULD include any known entities that provide such services into its service discovery items.
+An entity advertises support for this protocol by including the "urn:xmpp:http:upload" in its service discovery information features as specified in &xep0030; or section 6.3 of &xep0115;. To avoid unnecessary round trips an entity SHOULD also include the maximum file size as specified in &xep0128; if such a limitation exisits. The field name MUST be "max-file-size" and the value MUST be in bytes.
+A users server SHOULD include any known entities that provide such services into its service discovery items.