diff --git a/README.md b/README.md
index 75b899e..5eabb95 100644
--- a/README.md
+++ b/README.md
@@ -411,7 +411,7 @@ instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;
 
 ### Config order of precedence
 
-Config will be merged with an order of precedence. The order is library defaults found in `lib/defaults.js`, then `defaults` property of the instance, and finally `config` argument for the request. The latter will take precedence over the former. Here's an example.
+Config will be merged with an order of precedence. The order is library defaults found in [lib/defaults.js](https://github.com/axios/axios/blob/master/lib/defaults.js#L28), then `defaults` property of the instance, and finally `config` argument for the request. The latter will take precedence over the former. Here's an example.
 
 ```js
 // Create an instance using the config defaults provided by the library
diff --git a/lib/defaults.js b/lib/defaults.js
index 9587b28..65a25d5 100644
--- a/lib/defaults.js
+++ b/lib/defaults.js
@@ -63,6 +63,10 @@ var defaults = {
     return data;
   }],
 
+  /**
+   * A timeout in milliseconds to abort a request. If set to 0 (default) a
+   * timeout is not created.
+   */
   timeout: 0,
 
   xsrfCookieName: 'XSRF-TOKEN',