diff --git a/API-Protocol.md b/API-Protocol.md
index d6a5515..670192a 100644
--- a/API-Protocol.md
+++ b/API-Protocol.md
@@ -71,7 +71,7 @@ Authorization: Basic {basic_auth}
 The client submits its APN or GCM push registration ID.
 
 1. `basic_auth` is the client's authorization credentials (see above).
-1. `gcm_reistration_id` or `apn_registration_id` is the client's registration ID.
+1. `gcm_registration_id` or `apn_registration_id` is the client's registration ID.
 
 **Returns**: