Readme updates.

README.md

@@ -1,13 +1,17 @@
-# Making a query to DNS Lookup API web service
+# Using the DNS Lookup API web service
 
-[DNS Lookup API](https://www.whoisxmlapi.com/dns-api.php) is a REST API to 
-perform DNS queries via simple HTTP requests, receiving your results 
-back as JSON/XML-encoded objects.
+[DNS Lookup API](https://www.whoisxmlapi.com/dns-api.php) performs DNS queries
+via simple HTTP requests  and returns results containing the IP address of the
+primary domain (A record), DNS servers, mail servers (MX records) and more as
+JSON/XML-encoded objects.
 
-Here you'll find examples of using
-[DNS Lookup](https://www.whoisxmlapi.com/dns-api.php) Web API
-implemented in multiple languages.
+Here you'll find examples of using the API implemented in multiple languages.
 
-Please, refer to
+You'll need a
+[WhoisXmlApi account](https://www.whoisxmlapi.com/user/create.php) to
+authenticate.
+
+Please, refer to the
 [DNS Lookup API User Guide](https://www.whoisxmlapi.com/dns-api-guide.php) for
-authentication instructions.
+info on input parameters, request/response formats, authentication
+instructions and more.