diff --git a/README.md b/README.md
index 8ca7f3c..84d71ce 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ suspected something is wrong with your DNS? Here we have a set of tools to
 perform basic audits on your DNS requests and responses to make sure your DNS is
 working as you expect.
 
-You can measure the response time of any given DNS server for arbitrary
-requests using `dnsping`. Just like traditional ping utility, it gives you
-similar functionality for DNS requests.
+You can measure the response time of any given DNS server for arbitrary requests
+using `dnsping`. Just like traditional ping utility, it gives you similar
+functionality for DNS requests.
 
 You can also trace the path your DNS request takes to destination to make sure
 it is not being redirected or hijacked. This can be done by comparing different
@@ -25,9 +25,11 @@ of view.
 
 # prerequisites
 This script requires python3 as well as latest
-[dnspython](http://www.dnspython.org/). Please note that "dnstraceroute"
-requires a modified version of dnspython module, which is included. You just
-need to run `git submodule update --init`
+[dnspython](http://www.dnspython.org/) and
+[cymruwhois](https://pythonhosted.org/cymruwhois/). Please note that
+"dnstraceroute" requires a modified version of dnspython module. All required
+third-party modules are included as GIT submodules. You just need to run `git
+submodule update --init` and project directory to pull the required code.
 
 # dnsping
 dnsping pings a DNS resolver by sending an arbitrary DNS query for given number