diff --git a/README.md b/README.md
index aff4f20..a72d1f1 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,27 @@
 # Print a book from VitalSource Bookshelf to PDF
 
-This script simulates mouse click in the next page button and takes screenshot of
-current page in the opened book.
+This script simulates mouse click in the next page button and takes screenshot
+of current page in the opened book.
 
+This script depends on pyautogui for automating mouse clicks and screenshots.
+pyautogui uses the Pillow module for screenshots. OS X uses the "screencapture"
+command. Linux uses the "scrot" command, which you may need to install.
 
 ## Usage
 
 ```bash
 pip install -r requirements.txt
-python app.py top_left right_bottom next_button total_page
-# Ex: python app.py 153,78 892,990 941,537 785
+python vitalsource-printer.py top_left right_bottom next_button total_page
+# Ex: python vitalsource-printer.py 153,78 892,990 941,537 785
+```
+
+## Finding Cursor Coordinates
+
+To find the coordinates you will need to supply as inputs for the
+script, you may use "position()" function of the pyautogui module.
+
+```bash
+python
+>>> import pyautogui
+>>> pyautogui.position() # while cursor is on desired location
 ```
diff --git a/requirements.txt b/requirements.txt
index c9dd2eb..efe58f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-autopy
+pyautogui
 img2pdf
diff --git a/app.py b/vitalsource-printer.py
similarity index 79%
rename from app.py
rename to vitalsource-printer.py
index 8fc0877..5e19415 100644
--- a/app.py
+++ b/vitalsource-printer.py
@@ -1,8 +1,11 @@
+#!/usr/bin/env python3
+
 import argparse
 import os
 import tempfile
+import time
 
-import autopy
+import pyautogui
 import img2pdf
 
 
@@ -15,9 +18,13 @@ def screenshot(top_left, right_bottom, next_page, total_page):
         file_name = os.path.join(temp_dir, 'book-page-{}.png'.format(page_num))
         images.append(file_name)
 
-        autopy.mouse.move(*next_page)
-        autopy.mouse.click(delay=1)
-        autopy.bitmap.capture_screen((top_left, rect_size)).save(file_name)
+        # Take a screenshot
+        pyautogui.screenshot(file_name,
+                             region=(top_left[0], top_left[1], rect_size[0],
+                                     rect_size[1]))
+        # click the next button
+        pyautogui.click(x=next_page[0], y=next_page[1])
+        time.sleep(1) # wait a second
 
     return images