Updated swap interval notes.

docs/window.dox

@@ -487,8 +487,10 @@ zero can be useful for benchmarking purposes, when it is not desirable to
 measure the time it takes to wait for the vertical retrace.  However, a swap
 interval of one lets you avoid tearing.
 
-Note that not all OpenGL implementations properly implement this function, in
-which case @ref glfwSwapInterval will have no effect.  Some drivers also have
-user settings that override requests by GLFW.
+Note that this may not work on all machines, as some drivers have
+user-controlled settings that override any swap interval the application
+requests.  It is also by default disabled on Windows Vista and later when using
+DWM (Aero), as using it there sometimes leads to severe jitter.  You can
+forcibly enable it for machines using DWM using @ref compile_options_win32.
 
 */