diff --git a/docs/tdv.1.adoc b/docs/tdv.1.adoc
index e5d2cc6..2c4d4b6 100644
--- a/docs/tdv.1.adoc
+++ b/docs/tdv.1.adoc
@@ -24,6 +24,9 @@ database files.
 
 Options
 -------
+*--gui*::
+	Launch the GUI even when run from a terminal.
+
 *-h*, *--help*::
 	Display a help message and exit.