diff --git a/API-Protocol.md b/API-Protocol.md
index d2b6801..d6a5515 100644
--- a/API-Protocol.md
+++ b/API-Protocol.md
@@ -25,8 +25,9 @@ PUT /v1/acccounts/code/{verification_code}
 Authorization: Basic {basic_auth}
 
 {
-  "signalingKey" : "{bas64_encoded_52_byte_key}"
-  "supportsSms" : false
+  "signalingKey" : "{base64_encoded_52_byte_key}",
+  "supportsSms" : false,
+  "registrationId" : "{14-bit number}"
 }
 ```