diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index b80bba679..eaaf545fd 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -915,6 +915,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Reactive Microservices Architecture](https://www.lightbend.com/ebooks/reactive-microservices-architecture-design-principles-for-distributed-systems-oreilly) (email address *requested*)
 * [Reactive Microsystems: The Evolution of Microservices at Scale](https://www.lightbend.com/ebooks/reactive-microsystems-evolution-of-microservices-scalability-oreilly) (email address *requested*)
 * [Refactor Like a Superhero](https://github.com/bespoyasov/refactor-like-a-superhero-online-book/blob/main/manuscript-en/README.md) - Alex Bespoyasov
+* [Safe by design](https://github.com/SanQri/safe-by-design) - Mykola Haliullin
 * [Scrum and XP from the Trenches](https://www.infoq.com/minibooks/scrum-xp-from-the-trenches-2)
 * [Serverless apps: Architecture, patterns, and Azure implementation](https://docs.microsoft.com/en-us/dotnet/standard/serverless-architecture/)
 * [Serverless Design Patterns and Best Practices](https://www.packtpub.com/free-ebooks/serverless-design-patterns-and-best-practices) - Brian Zambrano (Packt account *required*)