diff --git a/Usage.md b/Usage.md
index f86fa19..41608cc 100644
--- a/Usage.md
+++ b/Usage.md
@@ -188,7 +188,7 @@ optional args:
  -h      show help
 ```
 
-Note: The keys for option `-T` are **a**pparent disk usage / **d**isk usage / **e**xtension / **r**evision / **s**ize / **t**ime / **v**ersion.
+Note: The keys for option `-T` are **a**pparent disk usage / **d**isk usage / **e**xtension / **r**evision / **s**ize / **t**ime / **v**ersion. Capitalize to reverse (except **r**).
 
 ## Keyboard, mouse