diff --git a/README.md b/README.md
index 10a55b7..7f105ef 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,4 @@
 A collection of some in-depth articles about the Lightning Network:
 
 * [Lightning transactions: from Zero to Hero](./lightning-txs.md)
+* [Sphinx onion encryption: from Zero to Hero](./sphinx.md)