[Piglit] [PATCH] README: add a note about the test counts

[Dylan Baker]

It's worth noting that piglit run and piglit summary count tests
differently.

Signed-off-by: Dylan Baker <dylanx.c.baker at intel.com>
---
 README | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README b/README
index 773a350..8381ff4 100644
--- a/README
+++ b/README
@@ -274,6 +274,15 @@ The summary shows the 'status' of a test:
 There are also dmesg-* statuses. These have the same meaning as above, but are
 triggered by dmesg related messages.
 
+3.1 Note
+--------
+
+The way 'piglit run' and 'piglit summary' count tests are different, 'piglit
+run' counts the number of Test derived instance in the profile(s) selected,
+while 'piglit summary' counts the number of subtests a result contains, or it's
+result if there are no subtests. This means that the number shown by 'piglit
+run' and the total as calculated by 'piglit summary' may not match.
+
 
 4. Available test sets
 ----------------------
-- 
2.5.0