README.md in africastalking-ruby-2.1.4 vs README.md in africastalking-ruby-2.1.5.beta.1

- old
+ new

@@ -155,10 +155,10 @@
 voice.call options
 ```
 - `options`
     - `to`: A single recipient or an array of recipients. `REQUIRED`
         - array of recipients contains ['2XXXXXXXX', '2XXXXXXXX']
-    - `from`: Phone number that is registered with Africa's Talking account.`REQUIRED`
+    - `from`: Shortcode or alphanumeric ID that is registered with Africa's Talking account.`REQUIRED`
     - `clientRequestId`: String sent to your Events Callback URL that can be used to tag the call. `OPTIONAL`
 
 
 #### Fetch queued calls
 ```ruby