diff --git a/aamva_standard/barcode.py b/aamva_standard/barcode.py
index eed30cc..26a8ea6 100644
--- a/aamva_standard/barcode.py
+++ b/aamva_standard/barcode.py
@@ -1,29 +1,56 @@
-"""
-The barcode module parses identification card barcode data into python objects
+"""barcode.py
+
+This module provides functions for parsing AAMVA (American Association of Motor Vehicle Administrators) barcode data.
+
+Functions:
+- header_length(version: int) -> int:
+  Returns the length of the header based on the AAMVA version.
+
+- remove_all_before(_str: str, indicator: str) -> str:
+  Removes all characters in a string before a specified indicator.
+
+- parse_file_header(file: str) -> dict:
+  Parses the header of an AAMVA file and returns a dictionary with relevant information.
+
+- parse_subfile_designator(file: str, aamva_version_number: int, designator_index: int) -> tuple:
+  Parses the subfile designator from the file and returns a tuple with subfile type, offset, and length.
+
+- parse_subfile(file: str, data_element_separator: str, segment_terminator: str, 
+               subfile_type: str, offset: int, length: int) -> dict:
+  Parses a subfile from the AAMVA file and returns a dictionary with its elements.
+
+- parse_file(file: str) -> dict:
+  Parses the entire AAMVA file and returns a dictionary containing the header and subfile information.
+
 """
 
 
 def header_length(version: int) -> int:
     """
-    Returns the header length for the given version
-    
-    In version 2 of the AAMVA ID/DL standards a 2 byte jurisdiction version was
-    added to the header of the file. This change increased the total size of
-    the header from 19 bytes to 21 bytes.
+    Returns the length of the header based on the AAMVA version.
+
+    Args:
+        version (int): The AAMVA version number.
+
+    Returns:
+        int: The length of the header.
     """
     return 19 if version < 2 else 21
 
 
 def remove_all_before(_str: str, indicator: str) -> str:
     """
-    Removes all characters before the indicator in a string
-    
-    Example:
-    
-    remove_all_before("abc@123", "@")
-    returns: "@123"
-    
-    Raises a ValueError if the indicator is not found in the string.
+    Removes all characters in a string before a specified indicator.
+
+    Args:
+        _str (str): The input string.
+        indicator (str): The indicator to search for in the string.
+
+    Returns:
+        str: The modified string after removing characters before the indicator.
+
+    Raises:
+        ValueError: If the indicator is not found in the string.
     """
     if _str[0] != indicator:
         try:
@@ -35,6 +62,18 @@ def remove_all_before(_str: str, indicator: str) -> str:
 
 
 def parse_file_header(file: str) -> dict:
+    """
+    Parses the header of an AAMVA file and returns a dictionary with relevant information.
+
+    Args:
+        file (str): A string representing the content of the AAMVA file.
+
+    Returns:
+        dict: A dictionary containing the parsed header information.
+
+    Raises:
+        ValueError: If the file type in the header does not match the expected "ANSI ".
+    """
     if file[4:9] != "ANSI ":
         raise ValueError(
             f"header file type missing \"{file[4:9]}\" != \"ANSI \"")
@@ -58,6 +97,20 @@ def parse_subfile_designator(
         file: str,
         aamva_version_number: int,
         designator_index: int) -> tuple:
+    """
+    Parses the subfile designator from the AAMVA file.
+
+    Args:
+        file (str): A string representing the content of the AAMVA file.
+        aamva_version_number (int): The AAMVA version number.
+        designator_index (int): The index of the subfile designator.
+
+    Returns:
+        tuple: A tuple containing subfile type, offset, and length.
+
+    Raises:
+        IndexError: If the calculated cursor position is out of range.
+    """
     DESIGNATOR_LEGNTH = 10
     cursor = designator_index * DESIGNATOR_LEGNTH + \
         header_length(aamva_version_number)
@@ -74,6 +127,23 @@ def parse_subfile(
         subfile_type: str,
         offset: int,
         length: int) -> dict:
+    """
+    Parses a subfile from the AAMVA file and returns a dictionary with its elements.
+
+    Args:
+        file (str): A string representing the content of the AAMVA file.
+        data_element_separator (str): The separator between data elements in the subfile.
+        segment_terminator (str): The terminator for the subfile segment.
+        subfile_type (str): The expected type of the subfile.
+        offset (int): The starting position of the subfile in the file string.
+        length (int): The length of the subfile in the file string.
+
+    Returns:
+        dict: A dictionary containing the parsed subfile information.
+
+    Raises:
+        ValueError: If the subfile type or segment terminator is not found in the specified positions.
+    """
     end_offset = offset + length - 1
     if file[offset:offset + 2] != subfile_type:
         raise ValueError(
@@ -92,6 +162,18 @@ def parse_subfile(
 
 
 def parse_file(file: str) -> dict:
+    """
+    Parses the entire AAMVA file and returns a dictionary containing the header and subfile information.
+
+    Args:
+        file (str): A string representing the content of the AAMVA file.
+
+    Returns:
+        dict: A dictionary with "header" and "subfiles" keys, containing the parsed information.
+
+    Raises:
+        ValueError: If the number of entries in the header is less than 1.
+    """
     file = remove_all_before(file, "@")
     header = parse_file_header(file)
     if header["number_of_entries"] < 1: