diff --git a/doc/img/browse-contact.png b/doc/img/browse-contact.png
index 1037729..ddf6d00 100644
--- a/doc/img/browse-contact.png
+++ b/doc/img/browse-contact.png
Binary files differ
diff --git a/doc/img/chronochat-2.png b/doc/img/chronochat-2.png
new file mode 100644
index 0000000..0011b7e
--- /dev/null
+++ b/doc/img/chronochat-2.png
Binary files differ
diff --git a/doc/index.rst b/doc/index.rst
index 849bb82..871f77b 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -26,6 +26,13 @@
 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.
+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/browse-contact.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-2.png
+
+