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diff --git a/tirante/update_database.py b/tirante/update_database.py
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+"""MIT License
+
+Copyright (c) 2019 David Luevano
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+"""
+
+import os
+
+# Project specific imports.
+from get_chapters_list import get_chapters_list
+from chapters_manager import chapters_csv_to_list
+from chapter_images_manager import chapter_images_list_to_csv
+
+
+def update_database(main_url,
+                    manga_name_url,
+                    manga_name,
+                    manga_dir,
+                    manga_data_dir):
+    """
+    Updates the database already created, adding missing ones.
+    main_url: Main webpage name (source).
+    manga_name_url: Name of the manga in the url format
+    that's used by the webpage.
+    manga_name: Actual name of the manga, as it appears in the webpage.
+    manga_dir: Main manga folder in computer, subfolders here will be created.
+    manga_data_dir: Main manga data folder in computer.
+    """
+
+    # A better "naming" for the manga, for use with folder creation.
+    # As well as the name of the main database.
+    m_name = '_'.join(word.lower() for word in manga_name.split())
+    m_name_ext = ''.join([m_name, '.csv'])
+
+    # Navigate to where the main data folder is,
+    # then to where the manga folder is.
+    os.chdir(manga_data_dir)
+    try:
+        os.mkdir(m_name)
+        os.chdir(m_name)
+    except FileExistsError:
+        print(''.join([m_name,
+                       ' folder already exists.']))
+        os.chdir(m_name)
+
+    # Get a list of files present in path.
+    data_list_dir = os.listdir()
+
+    # First, download the data from the web.
+    new_chapter_list = get_chapters_list(main_url=main_url,
+                                         manga_name_url=manga_name_url,
+                                         manga_name=manga_name,
+                                         reverse_sorted=False)
+
+    # And then, read the current database.
+    last_chapter = chapters_csv_to_list(m_name_ext)[-1]
+
+    # The missing chapters.
+    missing_chapters = []
+    for chapter in new_chapter_list:
+        # If we get to the last acquired chapter, exit loop.
+        if chapter == last_chapter:
+            break
+        missing_chapters.append(chapter)
+
+    # Reverse the order.
+    missing_chapters = missing_chapters[::-1]
+
+    # Write the last chapters to already existing csv file.
+    # No need for checking if items are present,
+    # since that's checked on the last steps,
+    # that's how missing_chapters is acquired.
+    with open(m_name_ext, 'a') as outcsv:
+        for chapter in missing_chapters:
+            outcsv.write(''.join([chapter[0], ',', chapter[1], '\n']))
+
+    # Create the missing csv data files for each chapter.
+    for chapter in missing_chapters:
+        # Get the list for the images of each chapter.
+        chapter_name_ext = ''.join([chapter[1], '.csv'])
+        if chapter_name_ext not in data_list_dir:
+            chapter_images_list_to_csv(chapter)
+        else:
+            print(''.join([chapter_name_ext, ' already exists.']))