Index: src/org/w3c/unicorn/input/URIInputParameter.java
===================================================================
--- src/org/w3c/unicorn/input/URIInputParameter.java	(revision 1588:417425c0e228)
+++ src/org/w3c/unicorn/input/URIInputParameter.java	(revision 1714:65ec7ae95911)
@@ -102,5 +102,5 @@
 			
 			HttpURLConnection con = (HttpURLConnection) docUrl.openConnection();
-			con.setRequestProperty("User-agent", "W3C_Unicorn/1.0");
+			con.setRequestProperty("User-agent", "W3C_Unicorn/1.0 (http://validator.w3.org/services)");
 			con.setConnectTimeout(connectTimeOut);
 			con.setRequestMethod("HEAD");