diff --git a/BdfFontDemo/README.md b/BdfFontDemo/README.md
index ede9b9e..1146ed7 100644
--- a/BdfFontDemo/README.md
+++ b/BdfFontDemo/README.md
@@ -105,7 +105,7 @@ ________,________,________,
 
 # Font bounding box and character bounding box
 BDF font file has a font bounding box (FONTBOUNDINGBOX).   
-This shows that the origin of the font is X=-3, Y=-6.   
+This indicates that there is a 6 pixel margin below the font.   
 ```
 FONTBOUNDINGBOX 21 26 -3 -6
 ```
@@ -158,6 +158,42 @@ BITMAP
 ENDCHAR
 ```
 
+Fonts that take character bounding box (BBX) and font bounding box (FONTBOUNDINGBOX) into consideration change as follows.   
+```
+STARTCHAR d
+ENCODING 100
+SWIDTH 574 0
+DWIDTH 10 0
+BBX 9 12 0 0
+BITMAP
+00
+00
+00
+00
+00
+00
+00
+07
+03
+03
+03
+1F
+33
+63
+63
+63
+63
+33
+1D8
+00
+00
+00
+00
+00
+00
+ENDCHAR
+```
+
 Both the font bounding box (FONTBOUNDINGBOX) and the character bounding box (BBX) determine the display position.   
 This image takes into account the font bounding box (FONTBOUNDINGBOX) and character bounding box (BBX).   
 ```