diff --git a/hashdb.py b/hashdb.py
index e12000d..02b1b48 100644
--- a/hashdb.py
+++ b/hashdb.py
@@ -1,3 +1,6 @@
+'''
+hashdb.py
+'''
 import collections
 import hashlib
 import sqlite3
@@ -28,6 +31,13 @@ def get_file_sha1sum(filename):
     return sha1sum.hexdigest()
 
 def _build_sql_constraints(inclusive, constraints):
+    '''Build an SQL constraint clause out of a dictionary.
+
+    inclusive   - If True, uses SQL AND operator, otherwise OR will be used.
+    constraints - A dictionary of arbitrary constraints
+
+    returns a tuple containing the appropriately formatted SQL string and a list of parameters
+    '''
     if constraints == {}:
         return ('', [])
 
@@ -48,12 +58,13 @@ def _build_sql_constraints(inclusive, constraints):
     return (sql_constraint_string, sql_parameter_list)
 
 class HashDB:
+    '''Store and retrieve hash metadata from an SQLite database.'''
     # TODO: Low-priority: Probably design this around using multiple hash algorithms eventually.
     def __init__(self, filename):
-        """
+        '''
         If db file does not exist, create it and create necessary tables.
-        Either way, create a connection and a cursor.
-        """
+        Either way, create a connection object.
+        '''
         # TODO: This process needs real error handling.
         self._connection = sqlite3.connect(filename)
 
@@ -75,7 +86,7 @@ class HashDB:
 
 
     def add_hash(self, rom_info):
-        """ Add a hash to the database. """
+        ''' Add a hash to the database. '''
         # INSERT INTO sha1sums (sha1sum, filename, platform, datorigin);
         with self._connection:
             self._connection.execute('INSERT INTO sha1sums VALUES (?, ?, ?, ?)', rom_info)
@@ -87,7 +98,7 @@ class HashDB:
                 self._connection.execute('INSERT INTO sha1sums VALUES (?, ?, ?, ?)', rom_info)
 
     def remove_hash(self, rom_info):
-        """ Remove a hash from the database. """
+        ''' Remove a hash from the database. '''
         # DELETE FROM sha1sums WHERE sha1sum=sha1sum;
         with self._connection:
             self._connection.execute('DELETE FROM sha1sums WHERE sha1sum=?;', [rom_info.sha1sum])
@@ -99,7 +110,7 @@ class HashDB:
                 self._connection.execute('DELETE FROM sha1sums WHERE sha1sum=?;', [rom_info.sha1sum])
 
     def add_platform(self, platform_info):
-        """ Add a platform shortcode to the database. """
+        ''' Add a platform shortcode to the database. '''
         # TODO: Collisions need user input to resolve, so remove this try block later.
         try:
             with self._connection:
@@ -108,11 +119,11 @@ class HashDB:
             print('Warning: %s is already in database.' % platform_info.shortcode)
 
     def update_platform_aliases(self, shortcode, aliases):
-        """ Change the list of aliases for a platform shortcode """
+        ''' Change the list of aliases for a platform shortcode '''
         # UPDATE platforms SET aliases=aliases WHERE shortcode=shortcode;
 
     def remove_platform(self, platform_info):
-        """ Remove a platform and all associated DATs and hashes from the database. """
+        ''' Remove a platform and all associated DATs and hashes from the database. '''
         # DELETE FROM sha1sums WHERE platform=shortcode;
         # DELETE FROM dats WHERE platform=shortcode;
         # DELETE FROM platform WHERE platform=shortcode;
@@ -130,7 +141,7 @@ class HashDB:
             self._connection.execute('INSERT INTO platforms VALUES (?, ?, ?, ?);', dat_info)
 
     def remove_dat(self, dat_info):
-        """ Delete a DAT and all of its' hashes from the database. """
+        ''' Delete a DAT and all of its' hashes from the database. '''
         # DELETE FROM sha1sums WHERE datorigin=name;
         # DELETE FROM dats WHERE name=name;