Update 51-fig.md

Author: schmunk42

docs/51-fig.md

@@ -36,8 +36,6 @@ To initialize your application run the following commands once:
 They will make the `vendor` folder available in your project directory on your host machine.
 And sets up the database, along with an admin user.
 
-> You can replace the [Phundament 4 Docker image](https://github.com/phundament/docker) with your custom base container.
-
 
 #### Run
 
@@ -57,6 +55,10 @@ OS X, Windows
 
 > On Linux `docker.local` is usually equal to `localhost`, on OS X the command `echo $DOCKER_HOST` should print the IP of your host VM.
 
+### Customize
+
+You can replace the [Phundament 4 Docker image](https://github.com/phundament/docker) with your custom base container.
+
 
 ### Virtual hosts with Docker