diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
new file mode 100644
index 0000000..713a508
--- /dev/null
+++ b/docs/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Changelog
+
+## [Unreleased]
+
+### Added
+
+- Add class for existing directories
+- Add function to format a list human-readable
\ No newline at end of file
diff --git a/src/jcloud_docsgen/utils.py b/src/jcloud_docsgen/utils.py
index 76f2219..3e91789 100644
--- a/src/jcloud_docsgen/utils.py
+++ b/src/jcloud_docsgen/utils.py
@@ -19,6 +19,8 @@ The utilities for jcloud_docsgen
 import pathlib
 import os
 import errno
+from typing import Union
+import types
 
 class ExistingDirectory(pathlib.Path):
     '''
@@ -33,4 +35,51 @@ class ExistingDirectory(pathlib.Path):
             raise FileNotFoundError(errno.ENOENT, 'no such file or directory', path)
         if not os.path.isdir(path):
             raise NotADirectoryError(errno.ENOTDIR, 'not a directory', path)
-        super().__init__(*(path, *args), **kwargs)
\ No newline at end of file
+        super().__init__(*(path, *args), **kwargs)
+
+def _quote(string: str, quotation_mark: str) -> str:
+    '''
+    Quotes a string.
+    
+    :param string: The string to quote
+    :type string: str
+    :param quotation_mark: The quotation mark
+    :type quotation_mark: str
+
+    :return: The quoted string
+    :rtype: str
+    '''
+
+    return quotation_mark + string + quotation_mark
+
+def human_readable_list(ls: list, final_separator: str = 'and', quotation_mark: str = '') -> str:
+    '''
+    Generates a human-readable list from a list.
+
+    :param ls: The list.
+    :type ls: list
+    :param final_separator: The seperator between the last and the
+                            second-to-last element of the list. Default
+                            is 'and'.
+    :type final_separator: str
+    :param quotation_mark: The characters that are inserted before and
+                           after an element. Default is ''.
+    
+    :return: The human-readable list.
+    :rtype: str
+    '''
+
+    # empty list
+    if not ls:
+        return ''
+    
+    # list with one element
+    if len(ls) == 1:
+        return _quote(str(ls[0]), quotation_mark)
+    
+    return ', '.join(
+        [
+            _quote(str(obj), quotation_mark) # quote the string representation of the object
+            for obj in ls[:-1] # do not include the last element of the list
+        ]
+    ) + ' ' + final_separator + ' ' + _quote(str(ls[-1]), quotation_mark)
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diff --git a/tests/unit/_utils/test_human_readable_list.py b/tests/unit/_utils/test_human_readable_list.py
new file mode 100644
index 0000000..6665f3f
--- /dev/null
+++ b/tests/unit/_utils/test_human_readable_list.py
@@ -0,0 +1,40 @@
+from src.jcloud_docsgen.utils import human_readable_list
+import pytest
+
+@pytest.mark.parametrize('ls,final_separator,quotation_mark,expected', [
+    ([], '', '', ''),
+    ([], 'and', '', ''),
+    ([], 'and', '\'', ''),
+    ([1], '', '', '1'),
+    ([-1], '', '', '-1'),
+    ([0], '', '', '0'),
+    ([0.0], '', '', '0.0'),
+    ([-0.0], '', '', '-0.0'),
+    ([4.2], '', '', '4.2'),
+    ([-4.2], '', '', '-4.2'),
+    (['a'], '', '', 'a'),
+    ([1], 'and', '', '1'),
+    (['a'], 'and', '', 'a'),
+    ([1], 'and', '\'', '\'1\''),
+    (['a'], 'and', '\'', '\'a\''),
+    ([1, 2], 'and', '', '1 and 2'),
+    ([1, 2], 'and', '\'', '\'1\' and \'2\''),
+    ([1, 'a'], 'and', '', '1 and a'),
+    ([1, 'a'], 'and', '\'', '\'1\' and \'a\''),
+    ([1, 'a'], 'and', '', '1 and a'),
+    ([1, 'a'], 'and', '\'', '\'1\' and \'a\''),
+    ([1, 'a'], 'and', '\'', '\'1\' and \'a\''),
+    ([1, 'a'], '', '', '1  a'),
+    ([1, 'a'], '', '\'', '\'1\'  \'a\''),
+    ([1, 'a'], '', '', '1  a'),
+    ([1, 'a'], '', '\'', '\'1\'  \'a\''),
+    ([1, 'a'], '', '\'', '\'1\'  \'a\''),
+    ([1, 2, 3], 'and', '', '1, 2 and 3'),
+    ([1, 2, 3], '', '', '1, 2  3'),
+    ([1, 2, 3], 'and', '\'', '\'1\', \'2\' and \'3\''),
+    ([1, 2, 3], '', '\'', '\'1\', \'2\'  \'3\''),
+    ([1, 2, 3, 42, 'a', 23], 'and', '', '1, 2, 3, 42, a and 23'),
+    ([1, 2, 3, 42, 'a', 23], 'and', '\'', '\'1\', \'2\', \'3\', \'42\', \'a\' and \'23\''),
+])
+def test_human_readable_list(ls, final_separator, quotation_mark, expected):
+    assert human_readable_list(ls, final_separator, quotation_mark) == expected
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