--- a/README	Mon Nov 02 00:39:23 2015 +0000
+++ b/README	Fri Nov 06 18:02:05 2015 -0500
@@ -42,10 +42,15 @@
 for guidelines on the patch description.
 
 Please don't forget to update and run the tests when you fix a bug or
-add a feature. To run the tests:
+add a feature. To run the tests, you need a working copy of Mercurial,
+say in $HGSRC:
 
     cd tests
-    python run-tests.py --with-hg=/path/to/hg
+    python $HGSRC/tests/run-tests.py --with-hg=$HGSRC/hg
+
+(evolve's stable and default branches correspond to Mercurial's stable
+and default branches. So to test evolve from default, you need
+Mercurial on default.)
 
 
 Changelog