diff --git a/README.md b/README.md
index 7f25db8..ef3067a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # Node Bing API
 Node.js lib for the Azure Bing Web Search API
 
+## Changelog v2
+In order to follow JavaScript best practices and allow the library to
+be promisified, the callback function is now the last parameter.
+
 ## Installation
 ````
 npm install node-bing-api