x11-backend: Add a --scale option
diff --git a/man/weston.man b/man/weston.man
index f2d1b4c..fd1c7a5 100644
--- a/man/weston.man
+++ b/man/weston.man
@@ -186,6 +186,10 @@
 Make the default size of each X window
 .IR W x H " pixels."
 .TP
+.B \-\-scale\fR=\fIN\fR
+Give all outputs a scale factor of
+.I N.
+.TP
 .B \-\-use\-pixman
 Use the pixman renderer.  By default weston will try to use EGL and
 GLES2 for rendering.  Passing this option will make weston use the