CHANGE: Updated changelog and guide doc

README.md

@@ -121,6 +121,8 @@ information on what to include when reporting a bug.
 
 ## Changelog
 
+ - Added `glfwGetMonitorFromWindow` function to query the monitor where the
+   largest part of a window is currently located (#1699)
  - Added `GLFW_PLATFORM` init hint for runtime platform selection (#1958)
  - Added `GLFW_ANY_PLATFORM`, `GLFW_PLATFORM_WIN32`, `GLFW_PLATFORM_COCOA`,
    `GLFW_PLATFORM_WAYLAND`, `GLFW_PLATFORM_X11` and `GLFW_PLATFORM_NULL` symbols to

docs/window.dox

@@ -907,6 +907,19 @@ glfwSetWindowIcon(window, 0, NULL);
 @endcode
 
 
+@subsection window_monitor_from Window monitor
+
+Windows are always located on one or more monitors. You can get the
+handle for the monitor were the biggest part of a specified window is 
+currently located with @ref glfwGetMonitorFromWindow
+
+@code
+GLFWmonitor* monitor = glfwGetMonitorFromWindow(window);
+@endcode
+
+This monitor handle is one of those returned by @ref glfwGetMonitors.
+
+
 @subsection window_monitor Window monitor
 
 Full screen windows are associated with a specific monitor.  You can get the