diff --git a/README.rst b/README.rst
index 36d433e..0202e4e 100644
--- a/README.rst
+++ b/README.rst
@@ -95,7 +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
+      --log LOGFILE	 Append a one line CSV entry to LOGFILE
       --secure           Use HTTPS instead of HTTP when communicating with
                          speedtest.net operated servers
       --version          Show the version number and exit
diff --git a/speedtest-cli.1 b/speedtest-cli.1
index eb20ea7..3d4de55 100644
--- a/speedtest-cli.1
+++ b/speedtest-cli.1
@@ -58,6 +58,11 @@ URL of the Speedtest Mini server
 Source IP address to bind to
 .RE
 
+\fB\-\-log LOGFILE\fR
+.RS
+File to append a CSV log entry to
+.RE
+
 \fB\-\-version\fR
 .RS
 Show the version number and exit