diff --git a/main.py b/main.py
index 490937d..c7e4a9e 100644
--- a/main.py
+++ b/main.py
@@ -12,7 +12,8 @@ class CreateUser(Mutation):
 
     user = Field(UserType)
 
-    def mutate(self, info, name, age):
+    @staticmethod
+    def mutate(info, name, age):
         user = {"id": len(Query.users) + 1, "name": name, "age": age}
         Query.users.append(user)
         return CreateUser(user=user)
@@ -37,11 +38,15 @@ class Query(ObjectType):
         return [user for user in Query.users if user["age"] >= min_age]
 
 
-class Mut(ObjectType):
+class Mutation(ObjectType):
     create_user = CreateUser.Field()
 
+class UpdateUser(Mutation):
+    class Arguments:
+        name
 
-schema = Schema(query=Query, mutation=Mut)
+
+schema = Schema(query=Query, mutation=Mutation)
 
 gql = """
 query {
@@ -64,6 +69,15 @@ mutation{
     }
 }
 """
+gql3 = """
+query {
+    usersByMinAge(minAge: 0) {
+        id
+        name
+        age
+    }
+}
+"""
 
 
 if __name__ == "__main__":
@@ -71,3 +85,5 @@ if __name__ == "__main__":
     print(res)
     res = schema.execute(gql2)
     print(res)
+    res = schema.execute(gql3)
+    print(res)