diff --git a/README b/README
index 6782e2a0e..b022646bf 100644
--- a/README
+++ b/README
@@ -42,6 +42,10 @@ Requirements
 
 	* PostgreSQL (tested on 7.4) or MySQL (InnoDB and version 4.1+ required)
 
+	* XML-RPC for PHP library for XML-RPC support. Optional.
+	
+		http://phpxmlrpc.sourceforge.net
+		
 Installation Notes
 ==================