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diff --git a/man/blind-stack.1 b/man/blind-stack.1
index ca9ed9b..5a0a31f 100644
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@@ -3,7 +3,7 @@
blind-stack - Overlay videos
.SH SYNOPSIS
.B blind-stack
-[-b]
+[-bs]
.IR bottom-stream
.RI "... " top-stream
.SH DESCRIPTION
@@ -30,6 +30,10 @@ Instead of drawing the videos on top of each
other, for each pixel in each frame, print the
average colour for each input stream's
corresponding pixel and frame.
+.TP
+.B -s
+The output video will be as long as the shortest
+input video, rather than as the longest.
.SH SEE ALSO
.BR blind (7),
.BR blind-dissolve (1),