diff --git a/README.md b/README.md
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@@ -2,6 +2,6 @@
 
 Python module to control the Pertelian X2040 LCD Display.  
 
-Based on Pertelians [Hardware Instruction Set Docs](docs/hardware_instruction_set.md) and damonkohler's pypert module.  
+Based on Pertelians [Hardware Instruction Set Docs](docs/hardware_instruction_set.md) and damonkohler's [pypert module](https://github.com/damonkohler/pypert/blob/master/pertelian.py).  
 
 Check the file demo1.py for some example use of the library.
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