From 6c57bee65b5f1fd72187f821995323bbb20ba54f Mon Sep 17 00:00:00 2001
From: "Donald A. Lobo" <lobo@civicrm.org>
Date: Wed, 4 Dec 2013 21:50:02 -0800
Subject: [PATCH] CRM-13904 - add links to formula used

----------------------------------------
* CRM-13904: Improve proximity query accuracy
  http://issues.civicrm.org/jira/browse/CRM-13904
---
 CRM/Contact/BAO/ProximityQuery.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CRM/Contact/BAO/ProximityQuery.php b/CRM/Contact/BAO/ProximityQuery.php
index 8f1295ff1d..9008e6f4e8 100644
--- a/CRM/Contact/BAO/ProximityQuery.php
+++ b/CRM/Contact/BAO/ProximityQuery.php
@@ -36,6 +36,11 @@ class CRM_Contact_BAO_ProximityQuery {
 
   /**
    * Trigonometry for calculating geographical distances.
+   *
+   * Modification made in: CRM-13904
+   * http://en.wikipedia.org/wiki/Great-circle_distance
+   * http://www.movable-type.co.uk/scripts/latlong.html
+   *
    * All function arguments and return values measure distances in metres
    * and angles in degrees.  The ellipsoid model is from the WGS-84 datum.
    * Ka-Ping Yee, 2003-08-11
-- 
2.25.1