diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 4d31daebd..269ef4a52 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -692,6 +692,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Kafka gentle introduction](https://www.gentlydownthe.stream) - Mitch Seymour
 * [Kafka, The definitive Guide](https://assets.confluent.io/m/1b509accf21490f0/original/20170707-EB-Confluent_Kafka_Definitive-Guide_Complete.pdf) - Neha Narkhede (PDF)
 * [Linux IP Stacks Commentary](https://www.satchell.net/ipstacks/) - Stephen Satchell, H. B. J. Clifford (HTML) *(:construction: in process)*
+* [Linux Networking](https://linux-training.be/linuxnet.pdf) - Paul Cobbaut (PDF)
 * [Mininet Walkthrough](https://mininet.org/walkthrough/)
 * [Network Science](http://networksciencebook.com) - Albert-Laszló Barabási
 * [Networking! ACK!](https://wizardzines.com/zines/networking/) - Julia Evans (PDF)