diff --git a/src/server/api/endpoints/users/groups/transfer.ts b/src/server/api/endpoints/users/groups/transfer.ts
index ca0ab9ab29..b4284ab484 100644
--- a/src/server/api/endpoints/users/groups/transfer.ts
+++ b/src/server/api/endpoints/users/groups/transfer.ts
@@ -4,6 +4,7 @@ import define from '../../../define';
 import { ApiError } from '../../../error';
 import { getUser } from '../../../common/getters';
 import { UserGroups, UserGroupJoinings } from '../../../../../models';
+import { types, bool } from '../../../../../misc/schema';
 
 export const meta = {
 	desc: {
@@ -31,6 +32,12 @@ export const meta = {
 		},
 	},
 
+	res: {
+		type: types.object,
+		optional: bool.false, nullable: bool.false,
+		ref: 'UserGroup',
+	},
+
 	errors: {
 		noSuchGroup: {
 			message: 'No such group.',
diff --git a/src/server/api/endpoints/users/groups/update.ts b/src/server/api/endpoints/users/groups/update.ts
index ad9a1faa23..bc974621a3 100644
--- a/src/server/api/endpoints/users/groups/update.ts
+++ b/src/server/api/endpoints/users/groups/update.ts
@@ -3,6 +3,7 @@ import { ID } from '../../../../../misc/cafy-id';
 import define from '../../../define';
 import { ApiError } from '../../../error';
 import { UserGroups } from '../../../../../models';
+import { types, bool } from '../../../../../misc/schema';
 
 export const meta = {
 	desc: {
@@ -34,6 +35,12 @@ export const meta = {
 		}
 	},
 
+	res: {
+		type: types.object,
+		optional: bool.false, nullable: bool.false,
+		ref: 'UserGroup',
+	},
+
 	errors: {
 		noSuchGroup: {
 			message: 'No such group.',