Update help text and documentaition.
diff --git a/Tools/pybench/pybench.py b/Tools/pybench/pybench.py
index 6167d12..e0110d0 100755
--- a/Tools/pybench/pybench.py
+++ b/Tools/pybench/pybench.py
@@ -382,7 +382,7 @@
                SwitchOption('--no-syscheck',
                     '"disable" sys check interval (set to sys.maxint)', 0),
                ArgumentOption('-t', 'tests containing substring', ''),
-               ArgumentOption('-C', 'number of calibration runs (default 20)', 20)
+               ArgumentOption('-C', 'number of calibration runs', 20)
                ]
 
     about = """\