diff --git a/packages/server/src/constants/index.js b/packages/server/src/constants/index.js
index c71e43d1fa..90893730be 100644
--- a/packages/server/src/constants/index.js
+++ b/packages/server/src/constants/index.js
@@ -14,6 +14,7 @@ exports.FieldTypes = {
 
 exports.RelationshipTypes = {
   ONE_TO_MANY: "one-to-many",
+  MANY_TO_MANY: "many-to-many",
 }
 
 exports.AuthTypes = {