diff --git a/data/gamemoded.8 b/data/gamemoded.8
index a088638..a861ae0 100644
--- a/data/gamemoded.8
+++ b/data/gamemoded.8
@@ -28,6 +28,9 @@ Query the current status of gamemode
 .B \-h
 Print help text
 .TP 8
+.B \-t
+Run diagnostic tests on the current installation
+.TP 8
 .B \-v
 Print the version