--- a/toolkit/components/glean/docs/testing.md
+++ b/toolkit/components/glean/docs/testing.md
@@ -77,17 +77,17 @@ The [Glean Parser](https://github.com/mo
 has been augmented to generate FOG-specific APIs for Glean metrics.
 This augmentation is tested by running:
 
 `mach test toolkit/components/glean/pytest`
 
 These tests require Python 3+.
 If your default Python is Python 2, you may need to instead run:
 
-`mach python-test --python 3 toolkit/components/glean/pytest`
+`python3 mach python-test toolkit/components/glean/pytest`
 
 ## C++
 
 To test the C++ parts of FOG's implementation
 (like metric types)
 you should use `gtest`.
 FOG's `gtest` tests are in
 [`gtest/`](https://hg.mozilla.org/mozilla-central/file/tip/toolkit/components/glean/gtest/).
@@ -107,8 +107,11 @@ To test the JS parts of FOG's implementa
 you should use `xpcshell`.
 FOG's `xpcshell` tests are in
 [`xpcshell/`](https://hg.mozilla.org/mozilla-central/file/tip/toolkit/components/glean/xpcshell).
 
 You can either add a test case to an existing file or add a new file.
 If you add a new file, remember to add it to the
 [`xpcshell.ini`](https://hg.mozilla.org/mozilla-central/file/tip/toolkit/components/glean/xpcshell/xpcshell.ini)
 or the test runner will not be able to find it.
+
+To run FOG's JS tests, run:
+`./mach test toolkit/components/glean/xpcshell`