diff --git a/testing/run-write-tests.rst b/testing/run-write-tests.rst
index c7c36a7ba..59f1583f4 100644
--- a/testing/run-write-tests.rst
+++ b/testing/run-write-tests.rst
@@ -165,6 +165,18 @@ a failure, drop the ``-j`` flag:
 To limit how many tests run at once, pass an explicit number of
 worker processes instead, such as ``-j2``.
 
+To check that the test suite is included in an installed build, install Python
+to a fresh prefix and run the test suite with that installation.  For example,
+on Unix::
+
+    ./configure --prefix=/tmp/cpython-install
+    make -j3
+    make install
+    /tmp/cpython-install/bin/python3 -m test -j3
+
+Using the installed interpreter is important: running ``./python -m test`` from
+the checkout tests the build tree, not the installed files.
+
 .. _strenuous_testing:
 
 Finally, if you want to run tests under a more strenuous set of settings, you