diff --git a/content/lessons/code-this-not-that-python-edition/index.md b/content/lessons/code-this-not-that-python-edition/index.md
index 277e95a36..cdfc907f8 100644
--- a/content/lessons/code-this-not-that-python-edition/index.md
+++ b/content/lessons/code-this-not-that-python-edition/index.md
@@ -215,7 +215,7 @@ from sys import getsizeof
 
 # Inefficent way 💩: Using a list ❌
 L = [n for n in range(42_000)]
-sum(L) # 881979000
+sum(L) # 881979000 bytes
 getsizeof(L) # 351064 bytes
 
 # Efficient way 🔥: Use a generator ✅
@@ -264,4 +264,4 @@ f.close()
 # Pythonic way 🐍 -  Use a context manager ✅
 with open("file.txt", "w") as f:
     f.write("Hi mom!") 
-```
\ No newline at end of file
+```