diff --git a/How-to-Contribute.md b/How-to-Contribute.md
index 66fe639b06..6d92cc2c3a 100644
--- a/How-to-Contribute.md
+++ b/How-to-Contribute.md
@@ -152,11 +152,17 @@ Run the unit tests directly from a terminal by running `./scripts/test.sh` from
 
 We also have automated UI tests. The [smoke test README](https://github.com/Microsoft/vscode/blob/master/test/smoke/README.md) has all the details.
 
+### Unit Testing
+Run the tests directly from a terminal by running `./scripts/test.sh` from the `vscode` folder (`scripts\test` on Windows). The [test README](https://github.com/Microsoft/vscode/blob/master/test/README.md) has complete details on how to run and debug tests, as well as how to produce coverage reports.
+
 ### Linting
 We use [tslint](https://github.com/palantir/tslint) for linting our sources. You can run tslint across the sources by calling `gulp tslint` from a terminal or command prompt. You can also run `gulp tslint` as a Code task by pressing <kbd>CMD+P</kbd> (<kbd>CTRL+P</kbd> on Windows) and entering `task tslint`. Warnings from tslint show up in the `Errors and Warnings` quick box and you can navigate to them from inside Code.
 
 To lint the source as you make changes you can install the [tslint extension](https://marketplace.visualstudio.com/items/eg2.tslint).
 
+### Extensions
+The Visual Studio Marketplace is not available from the `vscode` open source builds. If you need to use or debug an extension you can you can check to see if the extension author publishes builds in their repository (check the `Builds` page) or if it is open source you can clone and build the extension locally. Once you have the .VSIX, you can "side load" the extension either through the command line or using __Install from VSIX__ command in the Extensions View command drop-down ([see more](https://code.visualstudio.com/docs/editor/extension-gallery#_command-line-extension-management) on command line extension management).
+
 ## Work Branches
 Even if you have push rights on the Microsoft/vscode repository, you should create a personal fork and create feature branches there when you need them. This keeps the main repository clean and your personal workflow cruft out of sight.