manpage: add -u flag in synopsis

diff --git a/i3lock.1 b/i3lock.1
index 311174941b15a6508fcb6a607a48bfc5a8edde66..8bc00f530a1bb518a3b28e50cb58d0735006ec63 100644 (file)
--- a/i3lock.1
+++ b/i3lock.1
@@ -26,6 +26,7 @@ i3lock \- improved screen locker
 .RB [\|\-t\|]
 .RB [\|\-p
 .IR pointer\|]
+.RB [\|\-u\|]
 
 .SH DESCRIPTION
 .B i3lock