diff --git a/phoon.1 b/phoon.1
index 525b02c..3e221c0 100644
--- a/phoon.1
+++ b/phoon.1
@@ -3,7 +3,7 @@
 phoon - show the PHase of the mOON
 .SH SYNOPSIS
 phoon
-.RB -l
+.RB [ -l
 .IR lines ]
 .RI [ date ]
 .SH DESCRIPTION