diff --git a/Documentation/fb/udlfb.txt b/Documentation/fb/udlfb.txt
index 473ceed..c6d90a6 100644
--- a/Documentation/fb/udlfb.txt
+++ b/Documentation/fb/udlfb.txt
@@ -87,20 +87,28 @@
 options, however.
 
 From the command line, pass options to modprobe
-modprobe udlfb defio=1 console=1
+modprobe udlfb fb_defio=0 console=1 shadow=1
 
-Or for permanent option, create file like /etc/modprobe.d/options with text
-options udlfb defio=1 console=1
+Or modify options on the fly at /sys/module/udlfb/parameters directory via
+sudo nano fb_defio
+change the parameter in place, and save the file.
 
-Accepted options:
+Unplug/replug USB device to apply with new settings
+
+Or for permanent option, create file like /etc/modprobe.d/udlfb.conf with text
+options udlfb fb_defio=0 console=1 shadow=1
+
+Accepted boolean options:
 
 fb_defio	Make use of the fb_defio (CONFIG_FB_DEFERRED_IO) kernel
 		module to track changed areas of the framebuffer by page faults.
-        	Standard fbdev applications that use mmap but that do not
-		report damage, may be able to work with this enabled.
-		Disabled by default because of overhead and other issues.
+		Standard fbdev applications that use mmap but that do not
+		report damage, should be able to work with this enabled.
+		Disable when running with X server that supports reporting
+		changed regions via ioctl, as this method is simpler,
+		more stable, and higher performance.
 
-console		Allow fbcon to attach to udlfb provided framebuffers. This
+console	Allow fbcon to attach to udlfb provided framebuffers. This
 		is disabled by default because fbcon will aggressively consume
 		the first framebuffer it finds, which isn't usually what the
 		user wants in the case of USB displays.