README.md in econfig-1.0.1 vs README.md in econfig-1.0.2

@@ -43,9 +43,14 @@
 
 ``` ruby
 MyApp.config[:aws_access_key_id]
 ```
 
+Sometimes you might want to bypass the strictness requirement in econfig, for
+example if you're running the application as part of a build process.  In that
+case you can set the environment variable `ECONFIG_PERMISSIVE`, and econfig
+will not raise errors on missing keys, instead returning `nil`.
+
 ## Configuring options.
 
 You can specify configuration through:
 
 1. ENV variables