diff --git a/auth.capnp b/auth.capnp
index f0e7062..25fd49d 100644
--- a/auth.capnp
+++ b/auth.capnp
@@ -28,6 +28,8 @@ $Rust.parentModule("schema");
 using CSharp = import "csharp.capnp";
 $CSharp.namespace("FabAccessAPI.Schema");
 
+using Api = import "api.capnp";
+
 interface Authentication {
     mechanisms @0 () -> ( mechs :List(Text) );
     # Get the list of mechanisms supported by the server
@@ -50,6 +52,9 @@ interface Authentication {
     # after sending an outcome or by a client after receiving an outcome.
     # A server receiving an abort after sending an outcome but before
     # receiving any other message MUST respect the abort.
+
+    whoami @4 () -> ( you :Api.User );
+    # Returns NULL if not authenticated and an User object if authenticated.
 }
 
 struct Request {