diff --git a/docs/cheatsheet/debugging.md b/docs/cheatsheet/debugging.md
index b4edf43e..fef6691e 100644
--- a/docs/cheatsheet/debugging.md
+++ b/docs/cheatsheet/debugging.md
@@ -138,7 +138,7 @@ Say you wrote a function to calculate the factorial of a number. In mathematics,
 >>> def factorial(n):
 ...     logging.debug('Start of factorial(%s)' % (n))
 ...     total = 1
-...     for i in range(1, n + 1):
+...     for i in range(0, n + 1):
 ...         total *= i
 ...         logging.debug('i is ' + str(i) + ', total is ' + str(total))
 ...     logging.debug('End of factorial(%s)' % (n))
@@ -159,6 +159,8 @@ Say you wrote a function to calculate the factorial of a number. In mathematics,
 # 2015-05-23 16:20:12,684 - DEBUG - End of program
 ```
 
+Using the log output, we can see that `for i in range(0, n + 1)` should have been `for i in range(1, n + 1)`.
+
 ## Logging Levels
 
 Logging levels provide a way to categorize your log messages by importance. There are five logging levels, described in Table 10-1 from least to most important. Messages can be logged at each level using a different logging function.