diff --git a/Extending.md b/05 Extending.md
similarity index 95%
rename from Extending.md
rename to 05 Extending.md
index 76b856d..01ad9df 100644
--- a/Extending.md
+++ b/05 Extending.md	
@@ -1,6 +1,6 @@
 Flight is designed to be an extensible framework. The framework comes with a set of default methods and components, but it allows you to map your own methods, register your own classes, or even override existing classes and methods.
 
-## Mapping Methods
+### Mapping Methods
 
 To map your own custom method, you use the `map` function:
 
@@ -12,7 +12,7 @@ To map your own custom method, you use the `map` function:
     // Call your custom method
     Flight::hello('Bob');
 
-## Registering Classes
+### Registering Classes
 
 To register your own class, you use the `register` function: