diff --git a/messages.asm b/messages.asm
index 35b8670..529b262 100644
--- a/messages.asm
+++ b/messages.asm
@@ -6,7 +6,7 @@ HEIGHT equ 0x18			; 24
 VIDEO_MODE equ 0x3		; 80x25 screen, text mode
 
 PIT_MODECOMMAND_PORT equ 0x43	; programmable interval timer mode/command port (used for speaker)
-PIT_CH2_DATA_PORT equ 0x42	; PIT channel 2 data port
+PIT_CH2_DATA_PORT equ 0x42		; PIT channel 2 data port
 
 ;; see http://www.ctyme.com/intr/int-10.htm for interrupts
 
@@ -36,9 +36,9 @@ mov sp, 0x2000	; initialise stack pointer
 ;;	1 1	8
 
 ;; initialise serial port
-mov ah, 0x0		; initialise UART
+mov ah, 0x0				; initialise UART
 mov al, 0b111_00_0_11	; baud 9600, no parity, 1 stop bit, 8 data bits
-mov dx, 0x0		; COM1
+mov dx, 0x0				; COM1
 int 0x14
 
 ;; Use color mode
@@ -159,7 +159,7 @@ newline:
 beep:
 	call    read_duration	; get duration from keyboard (in al)
 	mov     ah, 0
-	push    ax		; store on stack
+	push    ax				; store on stack
 
 	;; move 182 (0b10 11 011 0) into al
 	;; bit 7-6 = channel select (2, PC speaker)
@@ -185,7 +185,7 @@ beep:
 	or      al, 00000011b	; Set bits 1 and 0 (enable speaker, input = channel 2)
 	out     0x61, al		; Send new value
 
-	;; mov     bx, 50000       ; Pause for duration of note.
+	;; mov     bx, 50000	; Pause for duration of note.
 
 	;; multiply duration by 3125
 	pop bx		; pull duration value from stack into bx
@@ -200,10 +200,10 @@ beep:
 	mov     ecx, 65535
 .pause2:
 	dec     cx		; count down
-	jne     .pause2		; if not zero keep counting down
+	jne     .pause2	; if not zero keep counting down
 
 	dec     bx		; decrement duration counter
-	jne     .pause1		; keep doing that until it is 0
+	jne     .pause1	; keep doing that until it is 0
 
 	in      al, 0x61		; Preserve previous value
 	and     al, 11111100b	; Clear bits 1 and 0 (disable speaker, clear channel select)
@@ -220,10 +220,10 @@ beep:
 ;; - dx
 nonewline:
 	;; Write character
-	mov ah, 0x09		; write character with attribute
-	mov bh, 0x00		; page number
+	mov ah, 0x09			; write character with attribute
+	mov bh, 0x00			; page number
 	mov bl, [color_mode]	; BIOS colour code
-	mov cx, 0x01		; amount of times to print character
+	mov cx, 0x01			; amount of times to print character
 	int 0x10
 
 	;; Get current cursor position