Update README.md

Author: APMonitor

README.md

@@ -1,6 +1,6 @@
 # Process Dynamics and Control
 
-Source code for the [Process Dynamics and Control Course](https://apmonitor.com/pdc). The archive is organized by learning module from the [course schedule](https://apmonitor.com/pdc/index.php/Main/CourseSchedule) with source code by Topic, Quiz, Assignment, and Temperature Control Lab activity.
+Source code for the [Process Dynamics and Control Course](https://apmonitor.com/pdc). The archive is organized by learning module from the [course schedule](https://apmonitor.com/pdc/index.php/Main/CourseSchedule) with source code by Topic, Quiz, Assignment, and Temperature Control Lab activity. The [get_source.py](get_source.py) Python program retrieves the lastest version of the source code from each page listed in [pages.csv](pages.csv).
 
 ![PDC Course Overview](https://apmonitor.com/pdc/uploads/Main/pdc_overview.png)