update docs

README.md

@@ -56,7 +56,8 @@ You must begin in this mode, where Bubble runs locally on your machine.
 You'll setup the various cloud services required to run Bubble,
 and use the Local Launcher to start a Remote Launcher or a Bubble Node.
 
-This is the mode that the [Bubble Docker Launcher](docs/docker-launcher.md) runs.
+This is the mode run by the [Bubble Docker Launcher](docs/docker-launcher.md) and [Bubble Vagrant](docs/dev_vagrant.md)
+environments.
 
 Learn more about setting up [Local Launcher Mode](docs/local-launcher.md)
 

docs/dev_vagrant.md

@@ -3,6 +3,9 @@ Bubble Vagrant Developer Setup
 [Vagrant](https://www.vagrantup.com/) is a popular way to run pre-packaged software on virtual machines
 like VirtualBox and VMware.
 
+Bubble uses Vagrant to create a development environment where you can work on the codebase, and build,
+run and test the API server and frontend webapp.
+
 # Requirements
 Before starting a Bubble Vagrant box, you'll need install some software if you don't already have it: