Document -A option

sxiv.1

@@ -4,6 +4,8 @@ sxiv \- Simple X Image Viewer
 .SH SYNOPSIS
 .B sxiv
 .RB [ \-abcfhioqrtvZ ]
+.RB [ \-A
+.IR FRAMERATE ]
 .RB [ \-e
 .IR WID ]
 .RB [ \-G
@@ -36,6 +38,9 @@ manager.
 .B \-a
 Play animations of multi-frame images.
 .TP
+.BI "\-A " FRAMERATE
+Force frame rate on animated images to FRAMERATE
+.TP
 .B \-b
 Do not show info bar on bottom of window.
 .TP