diff --git a/a/assembler_nasm_linux.asm b/a/assembler_nasm_linux.asm
index c816f270..c038b4f9 100644
--- a/a/assembler_nasm_linux.asm
+++ b/a/assembler_nasm_linux.asm
@@ -3,17 +3,18 @@ section	.text
 
 _start:					;tell linker entry point
 
-	xor	ebx, ebx
+	xor	ebx,ebx 	;ebx=0
+	mov	ecx,msg		;address of message to write
 	lea	edx,[ebx+len]	;message length
-	mov	ecx,msg		;message to write
 	lea	eax,[ebx+4]	;system call number (sys_write)
 	inc	ebx		;file descriptor (stdout)
 	int	0x80		;call kernel
 
-	mov	al,1		;system call number (sys_exit)
+	xor	eax, eax	;set eax=0
+	inc	eax		;system call number (sys_exit)
 	int	0x80		;call kernel
 
-section	.data
+section	.rodata
 
 msg	db	'Hello, world!',0xa	;our string
 len	equ	$ - msg			;length of our string