diff --git a/README.rst b/README.rst
index fccf934..c057d69 100644
--- a/README.rst
+++ b/README.rst
@@ -95,6 +95,7 @@ Usage
       --mini MINI        URL of the Speedtest Mini server
       --source SOURCE    Source IP address to bind to
       --timeout TIMEOUT  HTTP timeout in seconds. Default 10
+      --log LOGFILE	 Generate simple CSV logfile
       --secure           Use HTTPS instead of HTTP when communicating with
                          speedtest.net operated servers
       --version          Show the version number and exit