Index: /trunk/src/VBox/Frontends/VirtualBox/src/main.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/main.cpp	(revision 26215)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/main.cpp	(revision 26216)
@@ -265,4 +265,5 @@
             "Usage:\n"
             "  --startvm <vmname|UUID>    start a VM by specifying its UUID or name\n"
+            "  --seamless                 switch to seamless mode during startup\n"
             "  --rmode %-18s select different render mode (default is %s)\n"
 # ifdef VBOX_WITH_DEBUGGER_GUI