diff --git a/strings/count_vowels.py b/strings/count_vowels.py
index 8a52b331c81b..63f75bbec1c6 100644
--- a/strings/count_vowels.py
+++ b/strings/count_vowels.py
@@ -1,28 +1,30 @@
 def count_vowels(s: str) -> int:
-    """
-    Count the number of vowels in a given string.
+    """Count the number of vowels in a given string.
+
+    Args:
+        s (str): Input string to count vowels in.
 
-    :param s: Input string to count vowels in.
-    :return: Number of vowels in the input string.
+    Returns:
+        int: Number of vowels in the input string.
 
     Examples:
-    >>> count_vowels("hello world")
-    3
-    >>> count_vowels("HELLO WORLD")
-    3
-    >>> count_vowels("123 hello world")
-    3
-    >>> count_vowels("")
-    0
-    >>> count_vowels("a quick brown fox")
-    5
-    >>> count_vowels("the quick BROWN fox")
-    5
-    >>> count_vowels("PYTHON")
-    1
+        >>> count_vowels("hello world")
+        3
+        >>> count_vowels("HELLO WORLD")
+        3
+        >>> count_vowels("123 hello world")
+        3
+        >>> count_vowels("")
+        0
+        >>> count_vowels("a quick brown fox")
+        5
+        >>> count_vowels("the quick BROWN fox")
+        5
+        >>> count_vowels("PYTHON")
+        1
     """
     if not isinstance(s, str):
-        raise ValueError("Input must be a string")
+        raise TypeError("Input must be a string")
 
     vowels = "aeiouAEIOU"
     return sum(1 for char in s if char in vowels)