--- a/rollbot.py	Wed Apr 04 00:09:27 2018 +0800
+++ b/rollbot.py	Wed Apr 04 00:10:04 2018 +0800
@@ -284,6 +284,7 @@
     rollbot.register_plugin('xep_0030')  # Service Discovery
     rollbot.register_plugin('xep_0045')  # Multi-User Chat
     rollbot.register_plugin('xep_0092')  # Software Version
+    rollbot.register_plugin('xep_0115')  # Entity Capabilities
     rollbot.register_plugin('xep_0199')  # XMPP Ping
     rollbot.register_plugin('xep_0249')  # Direct MUC Invitations