diff --git a/man/feh.pre b/man/feh.pre
index 0d8e5abec61399aef6e50e37e1525554682f7a0e..a50b173b07795d6202f633fe894bd6cf46910a42 100644
--- a/man/feh.pre
+++ b/man/feh.pre
@@ -960,6 +960,13 @@ on index 1 black/white, use
 .Qq --xinerama-index 0
 when setting the wallpaper.
 .
+.Pp
+.
+Use
+.Cm xrandr --listmonitor
+to determine how Xinerama monitor IDs map to screens/monitors in your setup.
+.
+.
 .It Cm --zoom Ar percent | Cm max | Cm fill
 .
 Zoom images by
@@ -1183,6 +1190,9 @@ For instance, if you have multiple screens connected and use e.g.
 will center or appropriately offset the image on each screen.
 You may even specify more than one file, in that case, the first file is set
 on screen 0, the second on screen 1, and so on.
+Use
+.Cm xrandr --listmonitor
+to determine how Xinerama monitor IDs map to screens / monitors in your setup.
 .
 .Pp
 .