Fix event processing guide section

docs/input.dox

@@ -33,8 +33,10 @@ information.
 
 GLFW needs to communicate regularly with the window system both in order to
 receive events and to show that the application hasn't locked up.  Event
-processing must be done regularly while you have visible windows and is normally
-done each frame after [buffer swapping](@ref buffer_swap).
+processing must be done regularly while you have any windows and is normally
+done each frame after [buffer swapping](@ref buffer_swap).  Even when you have
+no windows, event polling needs to be done in order to receive monitor
+connection events.
 
 There are two functions for processing pending events.  @ref glfwPollEvents,
 processes only those events that have already been received and then returns