diff --git a/README.md b/README.md
index d1db820..7c9b585 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,4 @@ A blockchain implementation in Go, as described in these articles:
 1. [Basic Prototype](https://jeiwan.cc/posts/building-blockchain-in-go-part-1/)
 2. [Proof-of-Work](https://jeiwan.cc/posts/building-blockchain-in-go-part-2/)
 2. [Persistence and CLI](https://jeiwan.cc/posts/building-blockchain-in-go-part-3/)
+3. [Transactions 1](https://jeiwan.cc/posts/building-blockchain-in-go-part-4/)