Index: src/java/org/apache/nutch/parse/ParseOutputFormat.java
===================================================================
--- src/java/org/apache/nutch/parse/ParseOutputFormat.java	(revision 1476883)
+++ src/java/org/apache/nutch/parse/ParseOutputFormat.java	(working copy)
@@ -303,6 +303,7 @@
         toHost = null;
       }
       if (toHost == null || !toHost.equals(fromHost)) { // external links
+        LOG.debug("Filtered external link " + toUrl + " linked to by " + fromUrl);
         return null; // skip it
       }
     }
@@ -315,13 +316,14 @@
         toUrl = filters.filter(toUrl);   // filter the url
       }
       if (toUrl == null) {
+        LOG.debug("Filtered url " + toUrl + " linked to by " + fromUrl);
         return null;
       }
     } catch (Exception e) {
+      LOG.debug("Filtered url " + toUrl + " linked to by " + fromUrl);
       return null;
     }
 
     return toUrl;
   }
-
 }