diff --git a/i3lock.1 b/i3lock.1
index 568430f..c2e7b43 100644
--- a/i3lock.1
+++ b/i3lock.1
@@ -71,8 +71,7 @@ you did not disable this in your X server).
 
 .TP
 .B \-i, \-\-image
-Display the given XPM image instead of a blank screen. You can convert an image to
-XPM by using convert(1) from ImageMagick or GIMP for example.
+Display the given PNG image instead of a blank screen.
 
 .TP
 .B \-c, \-\-color