make one's prefix unique
diff --git a/digesttreescene.cpp b/digesttreescene.cpp
index 50d170b..b0b3d7c 100644
--- a/digesttreescene.cpp
+++ b/digesttreescene.cpp
@@ -95,7 +95,7 @@
 #ifdef __DEBUG
   else 
   {
-    std::cout << "Couldn't find prefix, let's check"<< std::endl;
+    std::cout << "Couldn't find prefix, " << prefix.toStdString() << ": let's check"<< std::endl;
     Roster_iterator ii = m_roster.begin();
     while (ii != m_roster.end())
     {