diff --git a/cli.rkt b/cli.rkt
index dbfcf39..c242111 100755
--- a/cli.rkt
+++ b/cli.rkt
@@ -1,5 +1,6 @@
 #! /usr/bin/env racket
 #lang racket
+; vim: set tw=80 :
 
 (require "interpreter.rkt"
          racket/block)
diff --git a/gui.rkt b/gui.rkt
index c31b149..00d02e3 100644
--- a/gui.rkt
+++ b/gui.rkt
@@ -1,4 +1,5 @@
 #lang racket/gui
+; vim: set tw=80 :
 
 (require "interpreter.rkt"
          framework
@@ -250,4 +251,4 @@
 (append-editor-operation-menu-items m-edit #f)
 (send EDITOR set-max-undo-history 100)
 (send C set-editor EDITOR)
-(send F show #t)
\ No newline at end of file
+(send F show #t)
diff --git a/interpreter.rkt b/interpreter.rkt
index fbca78d..968cf15 100644
--- a/interpreter.rkt
+++ b/interpreter.rkt
@@ -1,4 +1,5 @@
 #lang racket
+; vim: set tw=80 :
 
 ; 2018-11-21 - Made by Claudio Maggioni - Tommaso Rodolfo Masera
 ; easybf