diff --git a/dos/main.k b/dos/main.k
index 89fa0ef..d6aa8b1 100644
--- a/dos/main.k
+++ b/dos/main.k
@@ -7,10 +7,26 @@
 main:
     enter
 
-    mov ax0, .hw
+    mov ax0, .msg
+    call print
+
+    call exit
+
+    leave
+    ret
+
+.msg = "Hello World :)\n"
+
+;
+; Exit function
+;
+exit:
+    enter
+
+    mov ax0, .msg
     call print
 
     leave
     ret
 
-.hw = "Hello World\n:)"
+.msg = "Goodbye World :(\n"