diff --git a/protocol.go b/protocol.go
index 4ef49e9..4e76d92 100644
--- a/protocol.go
+++ b/protocol.go
@@ -38,7 +38,7 @@ func (c *ClientID) Valid() (bool, string) {
 	case "robot", "spectator":
 		return true, ""
 	}
-	return false, "usergent must be 'robot' or 'spectator'"
+	return false, "useragent must be 'robot' or 'spectator'"
 }
 
 type ClientConfig struct {