[tools] testbot/TestWTBS: Update the description in the usage message.

[Francois Gouget]

Signed-off-by: Francois Gouget 
---
 testbot/tests/TestWTBS | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/testbot/tests/TestWTBS b/testbot/tests/TestWTBS
index 1cbec2e94..4a4aba962 100755
--- a/testbot/tests/TestWTBS
+++ b/testbot/tests/TestWTBS
@@ -165,7 +165,12 @@ if (defined $Usage)
   }
   print "Usage: $name0 [--jobs RANGES] [--mbox FILE] [--help]\n";
   print "\n";
-  print "Tests the Patches subject parser.\n";
+  print "Automate checking the Wine TestBot test Suite results.\n";
+  print "\n";
+  print "The expectations are described in the form of directives that specify\n";
+  print "expected job, task, patch or webpatch property values; and errors or strings in\n";
+  print "logs and reports.\n";
+  print "For more details, see the documentation in the $name0 source.\n";
   print "\n";
   print "Where:\n";
   print "  --jobs RANGES Only check the jobs in one of the specified comma-separated\n";