diff --git a/src/contributing/testing.md b/src/contributing/testing.md
index 0a1885a4..733c0213 100644
--- a/src/contributing/testing.md
+++ b/src/contributing/testing.md
@@ -260,3 +260,8 @@ MANIFEST.json can be regenerated automatically with the mach command `update-man
 This is equivalent to running
 
     ./mach test-wpt --manifest-update SKIP_TESTS
+
+## Running Devtools Tests
+
+The simplest way to run the Devtools tests in Servo is `./mach test-devtools` from the root directory.
+This will run all tests defined in `devtools_tests.py`. All Devtools-related test files exist in `python/servo/devtools_tests`.