diff --git a/xep-0260.xml b/xep-0260.xml
index 5c42085f..23fdff25 100644
--- a/xep-0260.xml
+++ b/xep-0260.xml
@@ -396,6 +396,10 @@ Romeo                               Juliet
   |--------------------------------->|
   |  ack                             |
   |<---------------------------------|
+  |  transport-accept (IBB)          |
+  |<---------------------------------|
+  |  ack                             |
+  |--------------------------------->|
   |  IBB "SESSION"                   |
   |=================================>|
   |  terminate                       |