diff --git a/lib/geo.js b/lib/geo.js
index 30d6931d..1dac1abd 100644
--- a/lib/geo.js
+++ b/lib/geo.js
@@ -138,7 +138,14 @@ function GeoPoint(data) {
   assert(data.lat <= 90, 'lat must be <= 90');
   assert(data.lat >= -90, 'lat must be >= -90');
 
+/**
+   * @property {Number} lat The latitude point in degrees. Range: -90 to 90.
+*/
   this.lat = data.lat;
+
+/**
+   * @property {Number} lng The longitude point in degrees. Range: -90 to 90.
+*/  
   this.lng = data.lng;
 }