diff --git a/Doc/tutorial/modules.rst b/Doc/tutorial/modules.rst
index de7aa0e2342946..47bf7547b4ae1d 100644
--- a/Doc/tutorial/modules.rst
+++ b/Doc/tutorial/modules.rst
@@ -27,14 +27,16 @@ called :file:`fibo.py` in the current directory with the following contents::
# Fibonacci numbers module
- def fib(n): # write Fibonacci series up to n
+ def fib(n):
+ """Write Fibonacci series up to n."""
a, b = 0, 1
while a < n:
print(a, end=' ')
a, b = b, a+b
print()
- def fib2(n): # return Fibonacci series up to n
+ def fib2(n):
+ """Return Fibonacci series up to n."""
result = []
a, b = 0, 1
while a < n:
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