Update readme.md

readme.md

@@ -11,11 +11,16 @@ I welcome people taking this addon and customizing it to their needs. A pull req
 
 1. Copy the contents of the snippet file (fblikes.snippet.php) from github
 2. Go to your MODX Revolution Manager, create a new snippet, paste the content from your clipboard and save it
-3. Open a resource or chunk (or wherever you want to display your fan number) and add the snippet call
-    [[!fbLikes? &pageid=`19110642979` &expiretime=`10030`]]
+3. Open a resource or chunk (or wherever you want to display your fan number) and add the snippet call:
+    ```[[!fbLikes? &pageid=`19110642979` &expiretime=`10800`]]```
 
-# Developed by
-**chsmedien**
-Christian Seel
-E-Mail: [email protected]
-Website: www.chsmedien.com
+## Parameters
+
+* pageid - the id of your facebook fanpage (username is also possible)
+* expiretime - lifetime of the cache in seconds (default 10800, 3 hours)
+
+## Developed by
+**chsmedien**  
+Christian Seel  
+E-Mail: [email protected]  
+Website: www.chsmedien.com