diff --git a/examples/osgmultitexture/osgmultitexture.cpp b/examples/osgmultitexture/osgmultitexture.cpp
index 0cab6ccbf..d8272fd20 100644
--- a/examples/osgmultitexture/osgmultitexture.cpp
+++ b/examples/osgmultitexture/osgmultitexture.cpp
@@ -110,7 +110,7 @@ int main( int argc, char **argv )
         {
             if (!textExt->isMultiTexturingSupported())
             {
-                std::cout<<"Warning: texture_cube_map not supported by OpenGL drivers, unable to run application."<<std::endl;
+                std::cout<<"Warning: multi-texturing not supported by OpenGL drivers, unable to run application."<<std::endl;
                 return 1;
             }
         }
diff --git a/examples/osgshaderterrain/osgshaderterrain.cpp b/examples/osgshaderterrain/osgshaderterrain.cpp
index a9fe927c1..8c215ffa6 100644
--- a/examples/osgshaderterrain/osgshaderterrain.cpp
+++ b/examples/osgshaderterrain/osgshaderterrain.cpp
@@ -810,12 +810,14 @@ int main( int argc, char **argv )
     // add model to viewer.
     viewer.setSceneData( node );
 
+    // register a test extension callback to be called when app realizes and gets a valid graphics context
     osg::ref_ptr<TestSupportCallback> testSupportCallback = new TestSupportCallback();
     viewer.setRealizeCallback(testSupportCallback.get());
 
     // create the windows and run the threads.
     viewer.realize();
     
+    // exit if we don't have the extensions this example needs.
     if (!testSupportCallback->_supported)
     {
         osg::notify(osg::WARN)<<testSupportCallback->_errorMessage<<std::endl;