diff --git a/Doc/tutorial/inputoutput.rst b/Doc/tutorial/inputoutput.rst
index dfa2806..417c3b1 100644
--- a/Doc/tutorial/inputoutput.rst
+++ b/Doc/tutorial/inputoutput.rst
@@ -338,7 +338,7 @@
    >>> f.read()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
-   ValueError: I/O operation on closed file
+   ValueError: I/O operation on closed file.
 
 
 .. _tut-filemethods: