diff --git a/README.md b/README.md
index e748295..2f24b1f 100644
--- a/README.md
+++ b/README.md
@@ -54,33 +54,37 @@ const users = [
   { "id": 3, "name": "Francesco", "age": 24 }
 ]
 
-/* response mocks for /users */
-module.exports = [
-  {
-    route: '/users',
-    responses: [
-      /* Respond with 400 Bad Request for PUT and DELETE requests (inappropriate on a collection) */
-      { request: { method: 'PUT' }, response: { status: 400 } },
-      { request: { method: 'DELETE' }, response: { status: 400 } },
-      {
-        /* for GET requests return the collection */
-        request: { method: 'GET' },
-        response: { type: 'application/json', body: users }
-      },
+module.exports = MockBase => class MockUsers extends MockBase {
+  mocks () {
+    /* response mocks for /users */
+    return [
       {
-        /* for POST requests, create a new user and return its location */
-        request: { method: 'POST' },
-        response: function (ctx) {
-          const newUser = ctx.request.body
-          users.push(newUser)
-          newUser.id = users.length
-          ctx.status = 201
-          ctx.response.set('Location', `/users/${newUser.id}`)
-        }
+        route: '/users',
+        responses: [
+          /* Respond with 400 Bad Request for PUT and DELETE requests (inappropriate on a collection) */
+          { request: { method: 'PUT' }, response: { status: 400 } },
+          { request: { method: 'DELETE' }, response: { status: 400 } },
+          {
+            /* for GET requests return the collection */
+            request: { method: 'GET' },
+            response: { type: 'application/json', body: users }
+          },
+          {
+            /* for POST requests, create a new user and return its location */
+            request: { method: 'POST' },
+            response: function (ctx) {
+              const newUser = ctx.request.body
+              users.push(newUser)
+              newUser.id = users.length
+              ctx.status = 201
+              ctx.response.set('Location', `/users/${newUser.id}`)
+            }
+          }
+        ]
       }
     ]
   }
-]
+}
 ```
 
 Next, launch `ws` passing in your mock response file: