diff --git a/doc/index.rst b/doc/index.rst
index edde6f1..d2edb05 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -28,20 +28,31 @@
 
 The default setting is derived from the key and certificate you installed in step 0. 
 
-.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/chronochat-2.png
-
 The left part of the panel is your contact list. 
 One must be one of your contacts if she/he wants to have a chat with you.
 Right now, it is empty, so let's add some contacts. 
 
-**Step 2**: Click the **Add** button in the lower left corner. 
-You should see a contact browsing dialog which collects all the existing contact certificate in the testbed, for example:
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/chronochat-2.png
 
-.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/browse-contact.png
+**Step 2**: Click the **Add** button in the lower left corner. 
+You should see a "Browse Contact" dialog which collects all the existing contact certificate in the testbed, for example:
+
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/browse-contact-1.png
 
 You can select the contact you want to add, and then click the **Add** button.
 Then you should see that the selected contact has been added into your contact list.
 
 .. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/chronochat-3.png
 
+If you know a contact's certificate name, you can add it directly via **Direct Add** button.
+
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/browse-contact-2.png
+
+You should see an "Add Contact" dialog, you can directly input the contact certificate name (without version number, e.g., /ndn/edu/ucla/KEY/cs/afanasev/ksk-1383327806/ID-CERT) into the **Contact** line, and then click **Fetch** button.
+
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/add-contact-1.png
+
+If the certificate can be fetched and verified, the dialog will show you the description about the certificate subject.
+
+.. image:: https://raw.github.com/bruinfish/ChronoChat-V2/master/doc/img/add-contact-2.png