diff --git a/README.md b/README.md
index 2aacf0e..b48473e 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,9 @@ yarn add @kalisio/feathers-s3
 
 The provided [example](./example/README.md) illustrates how to setup:
 * a [server app](./example/app.mjs)
+
+https://github.com/kalisio/feathers-s3/blob/fa8adde8181ccad740ed7fcfb92af1a5c43f9281/example/app.mjs#L1
+
 * a [browser client app](./example/public/index.html).
 
 _You can also have a look at the [tests](./test) in order to have different use cases of the library_.
diff --git a/example/README.md b/example/README.md
index bfdfcd7..99d49a3 100644
--- a/example/README.md
+++ b/example/README.md
@@ -15,6 +15,6 @@ cd example
 node ./app.mjs
 ```
 
-By default, the server is listening on port `3333`.
+_By default, the server is listening on port `3333`. You can change it by settting the environment variable `PORT` to the desired value._
 
 3. Connect to `localhost:3333`
\ No newline at end of file