diff --git a/Documentation/Running.rst b/Documentation/Running.rst
index ee3cea1..923539e 100644
--- a/Documentation/Running.rst
+++ b/Documentation/Running.rst
@@ -139,6 +139,11 @@ Updates the PHPStan baseline file to match the code.
 Running unit and functional tests
 =================================
 
+.. note::
+
+   Executing tests on Windows via `runTests.sh` should be done within the
+   [Windows Subsystem for Linux (WSL 2)](https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux).
+
 You can currently run these tests and coverages on the command line:
 
 .. index:: Commands; composer ci:coverage