diff --git a/free-programming-books.md b/free-programming-books.md
index bebca6dff5218c83d02779dd0b8bac3f2c2b596f..cd6e24f1f1b07e21ae68ed699b9aab82686e0db7 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -2796,6 +2796,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 ### Swift
 
+* [Essential Swift](https://essential-swift.programming-books.io) - Krzysztof Kowalczyk (Compiled from StackOverflow Documentation)
 * [Hacking with Swift](https://www.hackingwithswift.com)
 * [Swift Notes for Professionals](https://goalkicker.com/SwiftBook/) - Compiled from StackOverflow Documentation (PDF)
 * [The Swift Programming Language](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/index.html) (HTML) [(iBook)](https://itunes.apple.com/us/book/swift-programming-language/id881256329?mt=11)