README.md in mongoid_spacial-0.2.0 vs README.md in mongoid_spacial-0.2.2

@@ -20,21 +20,19 @@
 
   field :name,              type: String
   field :length,            type: Integer
   field :average_discharge, type: Integer
   field :source,            type: Array,    spacial: true
-  # if you want something besides the defaults {bit: 24, min: -180, max: 180} just set index to the options on the index
-  # field :source,            type: Array,    spacial: true
-  # try not set index for this field manually as we record what spacial fields are index for some handy fields later
 
   # set return_array to true if you do not want a hash returned all the time
-  field :mouth,             type: Array,    spacial: {lat: 'latitude', lng: 'longitude', return_array: true }
+  field :mouth,             type: Array,    spacial: {lat: :latitude, lng: :longitude, return_array: true }
 
   # simplified spacial indexing
-  # you can only index one
+  # you can only index one point in mongodb version below 1.9
+  # if you want something besides the defaults {bit: 24, min: -180, max: 180} just set index to the options on the index
   spacial_index :source
-  # alternative 
+
 end
 ```
 
 Before we manipulate the data mongoid_spacial handles is what we call points.
 
@@ -55,19 +53,21 @@
   length: 315,
   average_discharge: 21_400,
   # when setting array LONGITUDE MUST BE FIRST LATITUDE MUST BE SECOND
   # source: [-73.935833,44.106667],
   # but we can use hash in any order,
-  # the default keys for latitude and longitude are 'lat' and 'lng' respectively
-  source: {'lat' => 44.106667, 'lng' => -73.935833},
-  # remember keys must be strings
-  mouth: {'latitude' => 40.703056, 'longitude' => -74.026667}
+  # the default keys for latitude and longitude are :lat and :lng respectively
+  source: {:lat => 44.106667, :lng => -73.935833},
+  mouth: {:latitude => 40.703056, :longitude => -74.026667}
 )
 
 # now to access this spacial information we can now do this
-hudson.source #=> {'lng' => -73.935833, 'lat' => 44.106667}
+hudson.source #=> {:lng => -73.935833, :lat => 44.106667}
 hudson.mouth  #=> [-74.026667, 40.703056] # notice how this returned as a lng,lat array because return_array was true
 # notice how the order of lng and lat were switched. it will always come out like this when using spacial.
+# Also adds a handy distance function
+hudson.distance_from(:source, [-74,40], :mi)
+
 ```
 Mongoid Geo has extended all built in spacial symbol extentions
 
 * near
   * River.where(:source.near => [-73.98, 40.77])