diff --git a/connection.capnp b/connection.capnp
index 6ed2562..bdc3e2f 100644
--- a/connection.capnp
+++ b/connection.capnp
@@ -34,11 +34,9 @@ interface Bootstrap
     mechanisms @2 () -> ( mechs: List(Text) );
     # Get a list of Mechanisms this server allows in this context.
 
-    createSession @3 ( mechanism :Text, initialData :Data ) -> ( authentication :Authentication);
+    createSession @3 ( mechanism :Text ) -> ( authentication :Authentication );
     # Create a new session with the server that you wish to authenticate using `mechanism`.
-    # If the mechanism is a client-first mechanism you MAY set `initialData` to contain the data you
-    # want to send. If the mechanism is server-first or you do not wish to send initial data, make
-    # initialData a NULL-pointer.
+    # Using pipelining makes this one-roundtrip capable without explicit initial data support.
 }
 
 struct Session {