diff --git a/apiary.apib b/apiary.apib
index bd17bdc..b5b4be0 100644
--- a/apiary.apib
+++ b/apiary.apib
@@ -322,6 +322,28 @@ maintenance ownership to another user, immediatelly.
 Manages the users in the group. The only user that can do these kind of
 changes is the owner of the group.
 
+### Get a list of members [GET]
+
+**Authenticated**
+
++ Responde 200 (application/json)
+
+		{ "status": "OK", "users": [ { "username": "<username>",
+		                               "full_name": "<full name>"},
+									   ... ] }
+
++ Response 400 (application/json)
+
+        { "status": "ERROR", "error": "Invalid token" }
+
++ Response 401 (application/json)
+
+        { "status": "ERROR", "error": "User is not admin" }
+
++ Response 404 (application/json)
+
+        { "status": "ERROR", "error": "Group not found" }
+
 ### Adding members [PUT]
 
 + Request (application/json)
diff --git a/tests/group_tests.py b/tests/group_tests.py
index e3e95ed..ce44dc8 100644
--- a/tests/group_tests.py
+++ b/tests/group_tests.py
@@ -277,5 +277,15 @@ class TestUsersInGroup(LunchoTests):
         self.assertJsonError(rv, 404,
                              'Some users in the add list do not exist')
 
+    def test_add_unknown_group(self):
+        """Try to add users to some unknown group."""
+        request = {'usernames': ['unkonwn']}    # group not found should
+                                                # kick first
+        groupId = self.group.id + 10
+        rv = self.put('/group/{groupId}/users/'.format(groupId=groupId),
+                      request,
+                      token=self.user.token)
+        self.assertJsonError(rv, 404, 'Group not found')
+
 if __name__ == '__main__':
     unittest.main()