--- a/devtools/docs/tests/node-tests.md
+++ b/devtools/docs/tests/node-tests.md
@@ -1,34 +1,37 @@
 # DevTools node tests
 
 In addition to mochitests and xpcshell tests, some panels in DevTools are using node test libraries to run unit tests. For instance, several panels are using [Jest](https://jestjs.io/) to run React component unit tests.
 
-## DevTools node tests on Try
-### Find the node tests on Try
+## Find the node tests on Try
 
 The DevTools node tests are split in two different test suites on try:
 - `node(devtools)`: all the DevTools node tests, except the ones for the debugger
 - `node(debugger)`: only the Debugger node tests
 
 They are running on the `Linux 64 opt` platform. They are both tier 1 jobs, which means that any failure will lead to a backout.
 
-### On Try
+## Run Tests On Try
 
 To run the DevTools node tests on try, you can use `./mach try fuzzy` and look for the jobs named `source-test-node-debugger-tests` and `source-test-node-devtools-tests`.
 
 They are also run when using the "devtools" preset: `./mach try --preset devtools`.
 
 ### Node tests try job definition
 
 The definition of those try jobs can be found at [taskcluster/ci/source-test/node.yml](https://searchfox.org/mozilla-central/source/taskcluster/ci/source-test/node.yml).
 
 The definition also contains the list of files that will trigger the node test jobs. Currently the debugger tests run when any file is modified under `devtools/client/debugger`, the devtools tests run when any file is modified under `devtools/client` or `devtools/shared`.
 
-## Locally
+## Run Tests Locally
+
+### Prerequisite: yarn
+
+You will need yarn to be installed in order to run both the debugger and the DevTools tests. See https://yarnpkg.com/docs/install/.
 
 ### Debugger
 
 To run the debugger node tests:
 ```
 > cd devtools/client/debugger/
 > yarn && node bin/try-runner.js
 ```