From 5cf655c862aa3c8a2438cda6f1b52f17bca4cc3a Mon Sep 17 00:00:00 2001
From: scottan <33283688+Scottan@users.noreply.github.com>
Date: Wed, 29 Apr 2026 20:27:17 +0100
Subject: [PATCH] Update 04-defensive_programming.md

---
 episodes/04-defensive_programming.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/episodes/04-defensive_programming.md b/episodes/04-defensive_programming.md
index bcf98cb..10a59ca 100644
--- a/episodes/04-defensive_programming.md
+++ b/episodes/04-defensive_programming.md
@@ -256,7 +256,7 @@ check_sign(val)
 ```
 
 ```output
-Value:  nan is a number.
+Value: nan is negative.
 ```
 
 However numpy does provide the `isnan()` function for testing if a value is NaN. Add an assertion test using this which will raise and error if the value is NaN.