diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -3,6 +3,6 @@ upcd8544
 
 MicroPython module for the PCD8544 LCD, originally used for the Nokia 5110.
 
-[Datasheet](https://www.sparkfun.com/datasheets/LCD/Monochrome/Nokia5110.pdf)
+[Datasheet](doc/PCD8544.pdf)
 
 ![](doc/wipy-lcd.jpg)
diff --git a/doc/PCD8544.pdf b/doc/PCD8544.pdf
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index 0000000..791b730
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