Update README.md

jklincn · Jul 10, 2024 · 0ea013d · 0ea013d
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 ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/jklincn/scull-linux5.4/test.yml) 
 
-Scull (Simple Character Utility for Loading Localities) is a char driver that acts on a memory area as though it were a device. It's an example driver in LDD3 (Linux Device Drivers, Third Edition). 
+Scull (Simple Character Utility for Loading Localities) is a char driver that acts on a memory area as though it were a device. It's an example driver in [LDD3 (Linux Device Drivers, Third Edition)](https://lwn.net/Kernel/LDD3/). 
 
 This project has implemented Scull on Linux 5.4 (Ubuntu 20.04) and written some functional testing programs (see [test](https://github.com/jklincn/scull-linux5.4/tree/master/test)).