diff --git a/Usage.md b/Usage.md
index 4410fd2..8d0dc31 100644
--- a/Usage.md
+++ b/Usage.md
@@ -186,7 +186,7 @@ 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.
 
 ## Keyboard, mouse