diff --git a/table2ascii/options.py b/table2ascii/options.py
index 12f04dd..10ae1b2 100644
--- a/table2ascii/options.py
+++ b/table2ascii/options.py
@@ -11,6 +11,6 @@ class Options:
 
     first_col_heading: bool
     last_col_heading: bool
-    column_widths: Optional[List[int]]
+    column_widths: Optional[List[Optional[int]]]
     alignments: Optional[List[Alignment]]
     style: TableStyle
diff --git a/table2ascii/table_style.py b/table2ascii/table_style.py
index 0be50e2..d3c9b93 100644
--- a/table2ascii/table_style.py
+++ b/table2ascii/table_style.py
@@ -65,10 +65,10 @@ def from_string(cls, string: str) -> "TableStyle":
         Create a TableStyle from a string
 
         Args:
-            string: The string to create the TableStyle from
+            string (:class:`str`): The string to create the TableStyle from
 
         Returns:
-            TableStyle: A TableStyle object
+            :class:`TableStyle`: A TableStyle object
 
         Example::
 
diff --git a/table2ascii/table_to_ascii.py b/table2ascii/table_to_ascii.py
index 3f77d89..51a4768 100644
--- a/table2ascii/table_to_ascii.py
+++ b/table2ascii/table_to_ascii.py
@@ -56,11 +56,13 @@ def __init__(
             for i in range(len(options.column_widths)):
                 option = options.column_widths[i]
                 minimum = self.__column_widths[i]
-                if option < minimum:
+                if option is None:
+                    option = minimum
+                elif option < minimum:
                     raise ValueError(
                         f"The value at index {i} of `column_widths` is {option} which is less than the minimum {minimum}."
                     )
-            self.__column_widths = options.column_widths
+                self.__column_widths[i] = option
 
         self.__alignments = options.alignments or [Alignment.CENTER] * self.__columns
 
@@ -314,7 +316,7 @@ def table2ascii(
     *,
     first_col_heading: bool = False,
     last_col_heading: bool = False,
-    column_widths: Optional[List[int]] = None,
+    column_widths: Optional[List[Optional[int]]] = None,
     alignments: Optional[List[Alignment]] = None,
     style: TableStyle = PresetStyle.double_thin_compact,
 ) -> str:
@@ -322,17 +324,27 @@ def table2ascii(
     Convert a 2D Python table to ASCII text
 
     Args:
-        header (:class:`Optional[List[Any]]`): List of column values in the table's header row
-        body (:class:`Optional[List[List[Any]]]`): 2-dimensional list of values in the table's body
-        footer (:class:`Optional[List[Any]]`): List of column values in the table's footer row
-        first_col_heading (:class:`bool`): Whether to add a header column separator after the first column
-        last_col_heading (:class:`bool`): Whether to add a header column separator before the last column
-        column_widths (:class:`Optional[List[int]]`): List of widths in characters for each column (``None`` for auto-sizing)
-        alignments (:class:`List[Alignment]`): List of alignments (ex. `[Alignment.LEFT, Alignment.CENTER, Alignment.RIGHT]`)
-        style (:class:`TableStyle`): Table style to use for styling (preset styles can be imported)
+        header (Optional[List[Any]]): List of column values in the table's header row.
+            If not specified, the table will not have a header row.
+        body (Optional[List[List[Any]]]): 2-dimensional list of values in the table's body.
+            If not specified, the table will not have a body.
+        footer (Optional[List[Any]]): List of column values in the table's footer row.
+            If not specified, the table will not have a footer row.
+        first_col_heading (:class:`bool`): Whether to add a header column separator after the first
+            column. Defaults to ``False``.
+        last_col_heading (:class:`bool`): Whether to add a header column separator before the last
+            column. Defaults to ``False``.
+        column_widths (Optional[List[Optional[:class:`int`]]]): List of widths in characters for each
+            column. Any value of ``None`` indicates that the column width should be determined automatically.
+            If ``column_widths`` is set to ``None``, all columns will be automatically sized. Defaults to ``None``.
+        alignments (Optional[List[:class:`Alignment`]]): List of alignments for each column
+            (ex. ``[Alignment.LEFT, Alignment.CENTER, Alignment.RIGHT]``). If not specified or set to ``None``,
+            all columns will be center-aligned. Defaults to ``None``.
+        style (:class:`TableStyle`): Table style to use for styling (preset styles can be imported).
+            Defaults to :data:`PresetStyle.double_thin_compact`.
 
     Returns:
-        str: The generated ASCII table
+        :class:`str`: The generated ASCII table
     """
     return TableToAscii(
         header,
diff --git a/tests/test_column_widths.py b/tests/test_column_widths.py
index f7b367d..60f23f9 100644
--- a/tests/test_column_widths.py
+++ b/tests/test_column_widths.py
@@ -47,6 +47,28 @@ def test_column_widths_none():
     assert text == expected
 
 
+def test_column_widths_contains_none():
+    text = t2a(
+        header=["#", "G", "H", "R", "S"],
+        body=[["1", "30", "40", "35", "30"], ["2", "30", "40", "35", "30"]],
+        footer=["TOTL", "130", "140", "135", "130"],
+        first_col_heading=True,
+        last_col_heading=True,
+        column_widths=[7, None, 5, 5, None],
+    )
+    expected = (
+        "╔═══════╦═════════════════╦═════╗\n"
+        "║   #   ║  G     H     R  ║  S  ║\n"
+        "╟───────╫─────────────────╫─────╢\n"
+        "║   1   ║ 30    40    35  ║ 30  ║\n"
+        "║   2   ║ 30    40    35  ║ 30  ║\n"
+        "╟───────╫─────────────────╫─────╢\n"
+        "║ TOTL  ║ 130   140   135 ║ 130 ║\n"
+        "╚═══════╩═════════════════╩═════╝"
+    )
+    assert text == expected
+
+
 def test_wrong_number_column_widths():
     with pytest.raises(ValueError):
         t2a(