--- a/pvl/hosts.py	Tue Dec 17 12:55:53 2013 +0200
+++ b/pvl/hosts.py	Tue Dec 17 17:31:41 2013 +0200
@@ -76,7 +76,7 @@
                     for eth in value.split() :
                         ethernet[len(ethernet)] = eth
             else :
-                raise ValueError("Unknown host attr: %s=%s" % (attr, value))
+                raise ValueError("%s: Unknown host field: %s=%s" % (host, field, value))
         
         if domain is None :
             domain = options.hosts_domain