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diff --git a/hacks/distort.man b/hacks/distort.man
index 178febd3..eedb924e 100644
--- a/hacks/distort.man
+++ b/hacks/distort.man
@@ -4,9 +4,21 @@ distort \- distort the content of the screen in interesting ways
 .SH SYNOPSIS
 .B distort
 [\-root] [\-window] [\-mono] [\-install] [\-noinstall] [\-visual \fIvisual\fP]
-[\-window\-id \fIwindow\-id\fP] [\-delay \fIusecs\fP] [\-radius \fIpixels\fP]
-[\-speed \fIint\fP] [\-number \fIint\fP] [\-swamp] [\-bounce] [\-reflect]
-[\-vortex] [\-magnify] [\-blackhole] [\-slow] [\-shm] [\-no\-shm]
+[\-window\-id \fIwindow\-id\fP]
+[\-delay \fIusecs\fP]
+[\-duration \fIsecs\fP]
+[\-radius \fIpixels\fP]
+[\-speed \fIint\fP]
+[\-number \fIint\fP]
+[\-swamp]
+[\-bounce]
+[\-reflect]
+[\-vortex]
+[\-magnify]
+[\-blackhole]
+[\-slow]
+[\-shm] [\-no\-shm]
+[\-fps]
 .SH DESCRIPTION
 The \fIdistort\fP program takes an image and lets circular zones of
 distortion wander randomly around it, distorting what is under them.
@@ -50,6 +62,9 @@ Specify which window id to use.
 .B \-delay \fIusecs\fP
 Specify the delay between subsequent animation frames in microseconds.
 .TP 8
+.B \-duration \fIseconds\fP
+How long to run before loading a new image.  Default 120 seconds.
+.TP 8
 .B \-radius \fIpixels\fP
 Specify the radius of the distortion zone in pixels.
 .TP 8
@@ -62,7 +77,9 @@ Specify the number of distortion zones.
 .TP 8
 .B \-swamp
 Instead of letting zones wander around, let small zones pop up like
-bubbles in a swamp and leave permanent distortion.
+bubbles in a swamp and leave permanent distortion.  \fBWARNING:\fP
+this option uses a \fIcolossal\fP amount of memory: keep the \fI\-radius\fP
+small when using \fI\-swamp\fP.
 .TP 8
 .B \-bounce
 Let zones wander around and bounce off the window border. This is the
@@ -89,6 +106,9 @@ Use shared memory extension.
 .TP 8
 .B \-no\-shm
 Don't use shared memory extension.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
 .SH ENVIRONMENT
 .PP
 .TP 8