--- a/tests/run-tests.py	Wed Sep 02 15:12:08 2015 -0400
+++ b/tests/run-tests.py	Wed Sep 02 15:19:05 2015 -0400
@@ -35,6 +35,8 @@
 #      ./run-tests.py -j2 -c --local test-s*  # unsupported (and broken)
 #  9) parallel, custom tmp dir:
 #      ./run-tests.py -j2 --tmpdir /tmp/myhgtests
+#  10) parallel, pure, tests that call run-tests:
+#      ./run-tests.py --pure `grep -l run-tests.py *.t`
 #
 # (You could use any subset of the tests: test-s* happens to match
 # enough that it's worth doing parallel runs, few enough that it