diff --git a/031_list_modification.py b/031_list_modification.py
index 8eac47bb..3676b07f 100644
--- a/031_list_modification.py
+++ b/031_list_modification.py
@@ -53,13 +53,16 @@
 
 # I've started it for you.
 
-print("")
+print("append_item_to_list")
 print("Function: append_item_to_list")
 
 def append_item_to_list(the_list, item):
   the_list.append(item)
   return the_list
 
+def check_that_these_are_equal(actual, expected):
+    assert actual == expected, f"Expected {expected}, but got {actual}"
+
 check_that_these_are_equal(
   append_item_to_list(['a', 'b'], 'c'), ['a', 'b', 'c'])
 check_that_these_are_equal(