tmp
diff --git a/doc/index.rst b/doc/index.rst
index fbc4d35..e670e72 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -8,7 +8,14 @@
.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/ncc.png
-and your default key and certificate have been generated and installed .
+You also need to have your default key generated and certificate installed.
+To check that, you can use a command line tool **ndnsec-ls-identity**, and you should see output similar to following:
+
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/ndnsec-ls-identity.png
+
+If you see nothing or something different in output, please go to `NDN Certifications`_ to set up your security environment.
+
+.. _NDN Certifications: http://ndncert.named-data.net/
Step 1. When you open ChronoChat App, you will see a contact panel as shown below.