Add location usage warnings

Author: oschwald

README.md

@@ -52,6 +52,13 @@ require 'vendor/autoload.php';
 Place the 'geoip.inc' file in the `include_path` as specified in your
 `php.ini` file or place it in the same directory as your PHP scripts.
 
+
+## IP Geolocation Usage ##
+
+IP geolocation is inherently imprecise. Locations are often near the center of
+the population. Any location provided by a GeoIP database should not be used to
+identify a particular address or household.
+
 ## Usage ##
 
 Gets country name by hostname :