diff --git a/doc/filters.texi b/doc/filters.texi
index fb8757ff8f..5dc85ae09f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -10233,6 +10233,12 @@ Use fontconfig to set the font. Note that the colons need to be escaped.
 drawtext='fontfile=Linux Libertine O-40\:style=Semibold:text=FFmpeg'
 @end example
 
+@item
+Draw "Test Text" with font size dependent on height of the video.
+@example
+drawtext="text='Test Text': fontsize=h/30: x=(w-text_w)/2: y=(h-text_h*2)"
+@end example
+
 @item
 Print the date of a real-time encoding (see strftime(3)):
 @example