diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -359,27 +359,27 @@ There are three forms, which can be comb
 
 Default Argument Values
 -----------------------
 
 The most useful form is to specify a default value for one or more arguments.
 This creates a function that can be called with fewer arguments than it is
 defined to allow.  For example::
 
-   def ask_ok(prompt, retries=4, complaint='Yes or no, please!'):
+   def ask_ok(prompt, retries=4, reminder='Please try again!'):
        while True:
            ok = input(prompt)
            if ok in ('y', 'ye', 'yes'):
                return True
            if ok in ('n', 'no', 'nop', 'nope'):
                return False
-           retries = retries - 1
+           retries -= 1
            if retries < 0:
-               raise OSError('uncooperative user')
-           print(complaint)
+               raise ValueError('invalid user response')
+           print(reminder)
 
 This function can be called in several ways:
 
 * giving only the mandatory argument:
   ``ask_ok('Do you really want to quit?')``
 * giving one of the optional arguments:
   ``ask_ok('OK to overwrite the file?', 2)``
 * or even giving all arguments: