diff --git a/applications/osgviewer/osgviewer.cpp b/applications/osgviewer/osgviewer.cpp
index 70770e831..bebeeec7e 100644
--- a/applications/osgviewer/osgviewer.cpp
+++ b/applications/osgviewer/osgviewer.cpp
@@ -131,6 +131,10 @@ int main(int argc, char** argv)
     arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
     arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
     arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");
+    arguments.getApplicationUsage()->addCommandLineOption("--SingleThreaded","Select SingleThreaded threading model for viewer.");
+    arguments.getApplicationUsage()->addCommandLineOption("--CullDrawThreadPerContext","Select CullDrawThreadPerContext threading model for viewer.");
+    arguments.getApplicationUsage()->addCommandLineOption("--DrawThreadPerContext","Select DrawThreadPerContext threading model for viewer.");
+    arguments.getApplicationUsage()->addCommandLineOption("--CullThreadPerCameraDrawThreadPerContext","Select CullThreadPerCameraDrawThreadPerContext threading model for viewer.");
 
     // if user request help write it out to cout.
     bool helpAll = arguments.read("--help-all");
@@ -194,6 +198,11 @@ int main(int argc, char** argv)
     viewer.addEventHandler(new osgViewer::StatsHandler);
 
 
+    while (arguments.read("--SingleThreaded")) viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
+    while (arguments.read("--CullDrawThreadPerContext")) viewer.setThreadingModel(osgViewer::Viewer::CullDrawThreadPerContext);
+    while (arguments.read("--DrawThreadPerContext")) viewer.setThreadingModel(osgViewer::Viewer::DrawThreadPerContext);
+    while (arguments.read("--CullThreadPerCameraDrawThreadPerContext")) viewer.setThreadingModel(osgViewer::Viewer::CullThreadPerCameraDrawThreadPerContext);
+
     unsigned int screenNum;
     while (arguments.read("--screen",screenNum))
     {