diff --git a/html/images/big.picture.png b/html/images/big.picture.png
index 10cf59fe..6bb9ec96 100644
Binary files a/html/images/big.picture.png and b/html/images/big.picture.png differ
diff --git a/html/index.html b/html/index.html
index b5dc05d8..da7e4b81 100644
--- a/html/index.html
+++ b/html/index.html
@@ -12,7 +12,7 @@
 <h3 id="overview">Overview</h3>
 <ul>
 <li><a href="./why.build.your.own.mail.server.html">Why build your own mail server instead of outsourcing to external entities</a></li>
-<li><a href="./used.components.html">Major open source softwares used in iRedMail</a></li>
+<li><a href="./used.components.html">Major open source softwares used in iRedMail, and big picture of mail flow</a></li>
 <li><a href="./network.ports.html">Which network ports are open by iRedMail</a></li>
 </ul>
 <h3 id="install-iredmail">Install iRedMail</h3>
diff --git a/overview/_links.md b/overview/_links.md
index 44b1f637..7e047c63 100644
--- a/overview/_links.md
+++ b/overview/_links.md
@@ -1,3 +1,3 @@
 * [Why build your own mail server instead of outsourcing to external entities](./why.build.your.own.mail.server.html)
-* [Major open source softwares used in iRedMail](./used.components.html)
+* [Major open source softwares used in iRedMail, and big picture of mail flow](./used.components.html)
 * [Which network ports are open by iRedMail](./network.ports.html)