diff --git a/inbox.graphql b/inbox.graphql
index 544db52..d1f6b7f 100644
--- a/inbox.graphql
+++ b/inbox.graphql
@@ -1,5 +1,9 @@
 scalar DateTime
 
+type _Service {
+    sdl: String
+}
+
 enum MessageStatus {
   NEW
   UPDATED