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diff --git a/README b/README
index 921a8fa..154e64d 100644
--- a/README
+++ b/README
@@ -1,24 +1,18 @@
 prevent the system from sleeping when a user is looking at the screen.
 
-this is accomplished using the built-in camera on my laptop screen's top bezel
-and opencv to detect a face.  i'm going to use the API used by the default movie
-player in ubuntu for preventing system sleeps.
+this is accomplished using a camera and opencv to detect a face.
 
-OTHER IDEAS:
-1. detecting a face could simulate user activity.  this would prevent sleeping
-and bring up the password prompt when the system is already asleep.
-	* how cool would that be?  if the system is asleep and you sit down at it, the
-	password prompt comes up before you touch anything!
-	* or if the screen saver doesn't lock the screen, then the laptop just wakes
-	up.
-2. authenticating a user based on face recognition (as opposed to face
-detection)
-	* much more difficult to do reliably
-3. be more aggressive with turning off the screen.  dim the screen as soon as
-it's not being looked at.  turn it off soon thereafter.
-	* could be enough to save battery.  would need to power the camera sometimes,
-	but would save on backlight.  need to test.
-4. don't prevent sleep when face is detected, but user isn't actually looking at
-screen.
-	* requires pose estimation.
-	* also requires estimating the direction of the eye.
+this readme is woefully short.
+
+you'll need to get a file called
+haarcascade_frontalface_alt.xml
+i was able to get it with this:
+  wget http://eclecti.cc/files/2008/03/haarcascade_frontalface_alt.xml
+
+i'm not sure what the rules are on distributing this file, so you'll
+have to get it yourself
+
+if you're on ubuntu:
+make ubuntu-dependencies
+make
+make test # assumes you have haarcascade_frontalface_alt.xml in current dir