clarified use of .yml and .yaml for Compose file, both can be used

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>

compose/compose-file.md

@@ -12,6 +12,8 @@ The Compose file is a [YAML](http://yaml.org/) file defining
 [volumes](compose-file.md#volume-configuration-reference).
 The default path for a Compose file is `./docker-compose.yml`.
 
+>**Tip:** You can use either a `.yml` or `.yaml` extension for this file. They both work.
+
 A service definition contains configuration which will be applied to each
 container started for that service, much like passing command-line parameters to
 `docker run`. Likewise, network and volume definitions are analogous to
@@ -1309,4 +1311,4 @@ If you forget and use a single dollar sign (`$`), Compose interprets the value a
 - [Get started with Django](django.md)
 - [Get started with Rails](rails.md)
 - [Get started with WordPress](wordpress.md)
-- [Command line reference](./reference/index.md)
+- [Command line reference](./reference/index.md)

compose/django.md

@@ -10,7 +10,7 @@ This quick-start guide demonstrates how to use Docker Compose to set up and run
 ### Define the project components
 
 For this project, you need to create a Dockerfile, a Python dependencies file,
-and a `docker-compose.yml` file.
+and a `docker-compose.yml` file. (You can use either a `.yml` or `.yaml` extension for this file.)
 
 1. Create an empty project directory.
 
@@ -183,4 +183,4 @@ In this section, you set up the database connection for Django.
 - [Get started with Rails](rails.md)
 - [Get started with WordPress](wordpress.md)
 - [Command line reference](./reference/index.md)
-- [Compose file reference](compose-file.md)
+- [Compose file reference](compose-file.md)

compose/rails.md

@@ -56,6 +56,9 @@ to link them together and expose the web app's port.
         depends_on:
           - db
 
+>**Tip:** You can use either a `.yml` or `.yaml` extension for this file.
+
+
 ### Build the project
 
 With those three files in place, you can now generate the Rails skeleton app
@@ -163,4 +166,4 @@ up`.
 - [Get started with Django](django.md)
 - [Get started with WordPress](wordpress.md)
 - [Command line reference](./reference/index.md)
-- [Compose file reference](compose-file.md)
+- [Compose file reference](compose-file.md)

compose/wordpress.md

@@ -4,8 +4,9 @@ keywords: documentation, docs,  docker, compose, orchestration, containers
 title: "Quickstart: Compose and WordPress"
 ---
 
-You can use Docker Compose to easily run WordPress in an isolated environment built
-with Docker containers. This quick-start guide demonstrates how to use Compose to set up and run WordPress. Before starting, you'll need to have
+You can use Docker Compose to easily run WordPress in an isolated environment
+built with Docker containers. This quick-start guide demonstrates how to use
+Compose to set up and run WordPress. Before starting, you'll need to have
 [Compose installed](install.md).
 
 ### Define the project
@@ -14,7 +15,10 @@ with Docker containers. This quick-start guide demonstrates how to use Compose t
 
     You can name the directory something easy for you to remember. This directory is the context for your application image. The directory should only contain resources to build that image.
 
-    This project directory will contain a `docker-compose.yaml` file which will be complete in itself for a good starter wordpress project.
+    This project directory will contain a `docker-compose.yml` file which will
+    be complete in itself for a good starter wordpress project.
+
+    >**Tip:** You can use either a `.yml` or `.yaml` extension for this file. They both work.
 
 2. Change directories into your project directory.
 
@@ -87,17 +91,22 @@ This pulls the needed images, and starts the wordpress and database containers,
 
 If you're using [Docker Machine](/machine/), then `docker-machine ip MACHINE_VM` gives you the machine address and you can open `http://MACHINE_VM_IP:8000` in a browser.
 
-At this point, WordPress should be running on port `8000` of your Docker Host, and you can complete the "famous five-minute installation" as a WordPress administrator.
+At this point, WordPress should be running on port `8000` of your Docker Host,
+and you can complete the "famous five-minute installation" as a WordPress
+administrator.
 
-**NOTE**: The WordPress site will not be immediately available on port `8000` because the containers are still being initialized and may take a couple of minutes before the first load.
+**NOTE**: The WordPress site will not be immediately available on port `8000`
+because the containers are still being initialized and may take a couple of
+minutes before the first load.
 
 ![Choose language for WordPress install](images/wordpress-lang.png)
 
 ![WordPress Welcome](images/wordpress-welcome.png)
 
 ### Shutdown/Clean up
-`docker-compose down` will remove the containers and default network, but preserve your wordpress database.
-`docker-compose down --volumes` will remove the containers, default network, and the wordpress database.
+`docker-compose down` will remove the containers and default network, but
+preserve your wordpress database. `docker-compose down --volumes` will remove
+the containers, default network, and the wordpress database.
 
 ## More Compose documentation