Add note on Environment translation

Fix #4

README.md

@@ -54,6 +54,8 @@ func init() {
 ```
 The configuration stage is where you configure `configure` by adding Checkers to the stack. Checkers are objects which will attempt to retrieve your variables from their respective data sources. When a `Checker` fails the next one in the stack is called, the stack is in the same order that the `Checker`'s were added in. You can configure `configure` anytime before you call the `conf.Parse()` function, but the `init()` function provides a reliable place to do so.
 
+*note:* When using the `Environment `Checker`, all keys will be translated to uppercase and have dashes replaced with underscores (ie. `hello-world` to `HELLO_WORLD`).
+
 ### Stage Three : Usage
 ```go
 func main() {

environment.go

@@ -8,6 +8,7 @@ import (
 )
 
 // NewEnvironment creates a new instance of the Environment Checker.
+// Note: If you request a value "peanut-butter", the environment variable that will be checked is `PEANUT_BUTTER`.
 func NewEnvironment() *Environment {
 	return &Environment{}
 }