diff --git a/src/osg/Notify.cpp b/src/osg/Notify.cpp
index f294b2fac..34fd2df6f 100644
--- a/src/osg/Notify.cpp
+++ b/src/osg/Notify.cpp
@@ -55,6 +55,7 @@ bool osg::initNotifyLevel()
         else if(stringOSGNOTIFYLEVEL.find("DEBUG_FP")!=std::string::npos)   g_NotifyLevel=osg::DEBUG_FP;
         else if(stringOSGNOTIFYLEVEL.find("DEBUG")!=std::string::npos)      g_NotifyLevel=osg::DEBUG_INFO;
         else if(stringOSGNOTIFYLEVEL.find("INFO")!=std::string::npos)       g_NotifyLevel=osg::INFO;
+        else std::cout << "Warning: invalid OSG_NOTIFY_LEVEL set ("<<stringOSGNOTIFYLEVEL<<")"<<std::endl;
  
     }