diff --git a/Command-line.md b/Command-line.md
index 2625c95..6a00b4c 100644
--- a/Command-line.md
+++ b/Command-line.md
@@ -68,4 +68,11 @@ Examples:
 -l test
 -l reporter xml
 -l xml
-</pre>
\ No newline at end of file
+</pre>
+
+## Sending output to a file
+<pre>
+-o, --out &lt;filename>
+</pre>
+
+Use this option to send all output to a file. Without the option output is sent to stdout (note that uses of stdout and stderr *from within test cases* are redirected and included in the report - so even stderr will effectively end up on stdout).