README.md in oauth2_api_client-3.1.1 vs README.md in oauth2_api_client-3.2.0

@@ -14,9 +14,16 @@
 client.post("/orders", json: { address: "..." }).status.success?
 client.headers("User-Agent" => "API Client").timeout(read: 5, write: 5).get("/orders").parse(:json)
 # ...
 ```
 
+In case an API is unprotected and you still want to use Oauth2ApiClient, you
+can simply not pass any token:
+
+```ruby
+client = Oauth2ApiClient.new(base_url: "...")
+```
+
 Oauth2ApiClient is capable of generating oauth2 tokens, when a client id,
 client secret and oauth token url is given with automatic token caching and
 renewal on expiry, including retry of the current request.
 
 ```ruby