update w-racer.sh

diff --git a/tests/w-racer.sh b/tests/w-racer.sh
index 987686f44d362ec067a0d5a4113ba3e11b53bc37..503e3eb84a035af44cc8b9e699f73c500f70befe 100755 (executable)
--- a/tests/w-racer.sh
+++ b/tests/w-racer.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 # RACER tests
+# Can run just on a lower f/s, or on wrapfs mounted on top of a lower f/s.
+# Can also stack wrapfs on top of another wrapfs.
 
 ##############################################################################
 # Scratch device to mount on /n/scratch.