diff --git a/01-boot-sector/README.md b/01-boot-sector/README.md
index 9cde4ee..9237751 100644
--- a/01-boot-sector/README.md
+++ b/01-boot-sector/README.md
@@ -31,7 +31,7 @@ You can either write the above 512 bytes
 with a binary editor, or just write a very
 simple assembler code:
 
-```
+```asm
 ; Infinite loop (e9 fd ff)
 loop:
     jmp loop