diff --git a/BdfFontDemo/README.md b/BdfFontDemo/README.md
index efa43b9..1f3fc3b 100644
--- a/BdfFontDemo/README.md
+++ b/BdfFontDemo/README.md
@@ -264,6 +264,15 @@ ________,______,
 ________,______,
 ```
 
+Changing FONTBOUNDINGBOX changes the character spacing.
+```
+COMMENT FONTBOUNDINGBOX 21 26 -3 -6
+FONTBOUNDINGBOX 21 26 -1 -6
+```
+
+![BdfFontDemo-1](https://github.com/user-attachments/assets/df733de1-b5b8-4142-8123-5a8f992246ff)
+![BdfFontDemo-4](https://github.com/user-attachments/assets/ab36b0e1-f179-4b28-a7fd-1a630abb9994)
+
 
 # Heder file format   
 This indicates the width of the FONTBOUNDINGBOX.