Add more information to readme

README.md

@@ -1,5 +1,27 @@
 # Remove Custom Headers
 
-Removes custom HTTP Response headers for Azure App Service web applications including Server, X-Powered-By, X-AspNet-Version and X-AspNetMvc-Version.
+Removes custom HTTP response headers for Azure App Service web applications including `Server`, `X-Powered-By`, `X-AspNet-Version` and `X-AspNetMvc-Version`.
 
 https://www.siteextensions.net/packages/RemoveCustomHeaders
+
+# How does it work?
+
+This extension is just a simple wrapper over the following `ApplicationHost.xdt` file:
+
+'''xml
+<?xml version="1.0"?>
+<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
+  <system.webServer>
+    <httpProtocol>
+      <customHeaders>
+        <add xdt:Transform="Remove" />
+      </customHeaders>
+    </httpProtocol>
+    <security>
+      <requestFiltering removeServerHeader="true" xdt:Transform="SetAttributes(removeServerHeader)" />
+    </security>
+  </system.webServer>
+</configuration>
+```
+
+These transform files are the supported way of allowing you to modify the default `ApplicationHost.config` file.