diff --git a/applications/osgdem/osgdem.cpp b/applications/osgdem/osgdem.cpp
index ef4e0e9ca..22f87017f 100644
--- a/applications/osgdem/osgdem.cpp
+++ b/applications/osgdem/osgdem.cpp
@@ -189,7 +189,7 @@ int main( int argc, char **argv )
     arguments.getApplicationUsage()->addCommandLineOption("--RGB-16","Use 16bit RGBA destination imagery");     
     arguments.getApplicationUsage()->addCommandLineOption("--RGBA","Use 32bit RGBA destination imagery");     
     arguments.getApplicationUsage()->addCommandLineOption("--max-visible-distance-of-top-level","Set the maximum visible distance that the top most tile can be viewed at");     
-    arguments.getApplicationUsage()->addCommandLineOption("--no-terrain-simplification","");
+    arguments.getApplicationUsage()->addCommandLineOption("--no-terrain-simplification","Switch off terrain simplification.");
     arguments.getApplicationUsage()->addCommandLineOption("--radius-to-max-visible-distance-ratio","Set the maximum visible distance ratio for all tiles apart from the top most tile. The maximum visuble distance is computed from the ratio * tile radius.");     
     arguments.getApplicationUsage()->addCommandLineOption("--no-mip-mapping","Disable mip mapping of textures");     
     arguments.getApplicationUsage()->addCommandLineOption("--mip-mapping-hardware","Use mip mapped textures, and generate the mipmaps in hardware when available.");