diff --git a/inbox.graphql b/inbox.graphql
index 1c3a204..e574494 100644
--- a/inbox.graphql
+++ b/inbox.graphql
@@ -1,3 +1,9 @@
+# duffok 2023-12-01
+# add sdl to _Service
+type _Service {
+    sdl: String
+}
+
 enum MessageStatus {
     NEW
     UPDATED