diff --git a/docs/violations/TC003.md b/docs/violations/TC003.md
index 0430285..41bb465 100644
--- a/docs/violations/TC003.md
+++ b/docs/violations/TC003.md
@@ -24,7 +24,7 @@ def another_function(num: int):
 ```py
 class ArgCantBeEven(Exception):
     def __init__(self, arg: int):
-        super().__init__(f"The argument '{a}' should be even")
+        super().__init__(f"The argument '{arg}' should be even")
 
 def first_function(a: int):
     if a % 2 == 0: