diff --git a/README.md b/README.md
index 3f99bd5..1fd7b2c 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,7 @@ Usage: dust -B (--bars-on-right - Percent bars moved to right side of screen)
 Usage: dust -i (Do not show hidden files)
 Usage: dust -c (No colors [monochrome])
 Usage: dust -C (Force colors)
-Usage: dust -f (Count files instead of diskspace)
+Usage: dust -f (Count files instead of diskspace [Counts by inode, to include duplicate inodes use dust -f -s])
 Usage: dust -t (Group by filetype)
 Usage: dust -z 10M (min-size, Only include files larger than 10M)
 Usage: dust -e regex (Only include files matching this regex (eg dust -e "\.png$" would match png files))