diff --git a/README.md b/README.md
index 2534470..fe17b42 100644
--- a/README.md
+++ b/README.md
@@ -5,4 +5,12 @@ This simple but useful App uses your iPhone’s camera to alert you when someone
 
 Click on the App and your front camera opens as you point it at anyone nearby. If someone is within 6 feet, the box around the person turns red. If the person is more than 6 feet away (approximately 2 meters), the the box around the person turns green. 
 
+# How to use
+
+Hold phone horizontally while directed at people. If the box around a person is green, they are beyond 6 feet from you. If the box around a person is red, they are within 6 feet of you. 
+
+If there is no box when the camera is pointed at a person, than the camera does not see the person clear enough.
+
+works best when person is standing.
+
 For more information, email ariwasch@gmail.com