diff --git a/src/chapter-28.md b/src/chapter-28.md
index 349e792..41b178d 100644
--- a/src/chapter-28.md
+++ b/src/chapter-28.md
@@ -698,7 +698,7 @@ DrawDiagonalLoop:
                             ; point to the next scan line
     ror  al,1               ;move the pixel mask one pixel to the right
     adc  bx,0               ;advance to the next byte if the pixel mask wrapped
-loopDrawDiagonalLoop
+loop DrawDiagonalLoop
 ;
 ; Wait for a key to be pressed to end, then return to text mode and
 ; return to DOS.