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diff --git a/Readme.md b/Readme.md
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+++ b/Readme.md
@@ -10,6 +10,7 @@ CMDline tool to Convert 24bit Windows BitMap files to ASCII with optional ANSI-c
 
 * -i use STDIN as file input
 
+* -w to print whitespaces with background color instead of ASCII chars. Only useful with -c
 To use with other image types, use imagemagick: `magick convert <image> -depth 24 bmp:- | asciimap -i`
 
 License: MIT