diff --git a/docs/porting/display.rst b/docs/porting/display.rst
index edf2ae2065..3fbbba9a77 100644
--- a/docs/porting/display.rst
+++ b/docs/porting/display.rst
@@ -232,6 +232,16 @@ If the performance monitor is enabled, the value of :c:macro:`LV_DEF_REFR_PERIOD
 consistent with the refresh period of the display to ensure that the statistical results are correct.
 
 
+Force refreshing
+----------------
+
+Normally the invalidated areas (marked for redraw) are rendered in :cpp:func:`lv_timer_handler` in every
+:cpp:macro:`LV_DEF_REFR_PERIOD`milliseconds. However, by using :cpp:func:`lv_refr_now(display)` you can ask LVGL to
+redraw the invalid areas immediately. The refreshing will happen in :cpp:func:`lv_refr_now` which might take
+longer time.
+
+The parameter of :cpp:func:`lv_refr_now` is a display to refresh. If ``NULL`` is set the default display will be updated.
+
 Events
 ******