diff --git a/lyx.man b/lyx.man
index b707c46225..10aa23e939 100644
--- a/lyx.man
+++ b/lyx.man
@@ -52,7 +52,8 @@ sets user directory. Needed if you want to use LyX with different lyxrc
 settings.
 .TP
 .BI \-geometry " WxH+X+Y"
-the preferred size and position of the main window in \fBLyX\fR.
+specifies the preferred size and position of the main \fBLyX\fR window; see \fIX
+(1)\fR.
 .TP
 .BI \-dbg " feature[,feature...]"
 where feature is a name or number.