diff --git a/lib/keyserver-conn/call-single-keyserver-endpoint.js b/lib/keyserver-conn/call-single-keyserver-endpoint.js
--- a/lib/keyserver-conn/call-single-keyserver-endpoint.js
+++ b/lib/keyserver-conn/call-single-keyserver-endpoint.js
@@ -48,7 +48,12 @@
   +urlPrefixOverride: string,
 }>;
 
-export type CallSingleKeyserverEndpointResultInfoInterface = 'socket' | 'REST';
+export type CallSingleKeyserverEndpointResultInfoInterface =
+  | 'socket'
+  | 'REST'
+  // this indicates that there was no call to the keyserver,
+  // a call used a different service, e.g. Tunnelbroker
+  | 'none';
 export type CallSingleKeyserverEndpointResultInfo = {
   +interface: CallSingleKeyserverEndpointResultInfoInterface,
 };