diff --git a/Usage.md b/Usage.md
index 67acbf9..f2c25ee 100644
--- a/Usage.md
+++ b/Usage.md
@@ -106,7 +106,7 @@ Use plugin `nbak` to backup configuration.
 ![hex-color-codes]()
 
 <p align="center"><img src="https://user-images.githubusercontent.com/1482942/93023823-46a6ba80-f5e1-11ea-9ea3-6a3c757704f4.png" /></p>
-<p align="center"><i>Table of hexadecimal numbers representing numbers</i></p>
+<p align="center"><i>Table of hexadecimal numbers representing numbers, note that the width has to be 2, e.g. "5" becomes "05"</i></p>
 
    - 8 colors numbers: 0-black, 1-red, 2-green, 3-yellow, 4-blue (default), 5-magenta, 6-cyan, 7-white.
    - To specify [xterm 256 color numbers](https://jonasjacek.github.io/colors/), prefix with `#` and use the hex values (2 symbols per context).