diff --git a/Doc/lib/tkinter.tex b/Doc/lib/tkinter.tex
index 943c4f2..f223ff6 100644
--- a/Doc/lib/tkinter.tex
+++ b/Doc/lib/tkinter.tex
@@ -258,8 +258,10 @@
         self.pack()
         self.createWidgets()
 
-app = Application()
+root = Tk()
+app = Application(master=root)
 app.mainloop()
+root.destroy()
 \end{verbatim}