diff --git a/01-boot-sector/README.md b/01-boot-sector/README.md
index e844dd9..7c68686 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:
 
-```assembler
+```nasm
 ; Infinite loop (e9 fd ff)
 loop:
     jmp loop