update copy explaining where to find plugins

website/source/community-tools.html.md

@@ -16,6 +16,9 @@ power of Packer templates.
 
 ## Third-Party plugins
 
+This is an incomplete list. If you have written your own plugin, please make a
+pull request to the website so that we can document your contribution here!
+
 - [ARM builder](https://github.com/solo-io/packer-builder-arm-image) - A builder
   for creating ARM images
 

website/source/docs/extending/plugins.html.md

@@ -21,10 +21,11 @@ This section will cover how to install and use plugins. If you're interested in
 developing plugins, the documentation for that is available below, in the
 [developing plugins](#developing-plugins) section.
 
-Because Packer is so young, there is no official listing of available Packer
-plugins. Plugins are best found via Google. Typically, searching "packer plugin
-*x*" will find what you're looking for if it exists. As Packer gets older, an
-official plugin directory is planned.
+The current official listing of available Packer plugins can be found
+[here](/community-tools.html#third-party-plugins). This is an incomplete list,
+and more plugins can be found by searching. Typically, searching "packer plugin
+*x*" will find what you're looking for if it exists. We hope to create an
+offical registry for third party plugins in the future.
 
 ## How Plugins Work