diff --git a/CIP-0003/Ledger.md b/CIP-0003/Ledger.md
index afdb2fcd57..b78782dbce 100644
--- a/CIP-0003/Ledger.md
+++ b/CIP-0003/Ledger.md
@@ -3,6 +3,8 @@
 - **Deprecated**: no
 - **Summary**: Used by Ledger hardware wallets
 
+Reference implementation by Ledger: [HDEd25519.py](https://github.com/LedgerHQ/orakolo/blob/0b2d5e669ec61df9a824df9fa1a363060116b490/src/python/orakolo/HDEd25519.py)
+
 *Note*: Ledger also allows users to set an additional [passphrase](https://support.ledger.com/hc/en-us/articles/115005214529-Advanced-passphrase-security)
 
 ## Code
@@ -20,7 +22,7 @@ function generateMasterKey(seed, password) {
     let cc = HMAC
         ( hash=SHA256
         , key="ed25519 seed"
-        , message=UTF8NFKD(1) + seed
+        , message=UTF8NFKD(1) + data
         );
 
     let (iL, iR) = hashRepeatedly(data);
@@ -82,7 +84,7 @@ function tweakBits(data) {
 
   master key
   ```
-  1091f9fd9d2febbb74f08798490d5a5727eacb9aa0316c9eeecf1ff2cb5d8e55bc21db1a20a1d2df9260b49090c35476d25ecefa391baf3231e56699974bdd46652f8e7dd4f2a66032ed48bfdffa4327d371432917ad13909af5c47d0d356beb
+  587c6774357ecbf840d4db6404ff7af016dace0400769751ad2abfc77b9a3844cc71702520ef1a4d1b68b91187787a9b8faab0a9bb6b160de541b6ee62469901fc0beda0975fe4763beabd83b7051a5fd5cbce5b88e82c4bbaca265014e524bd
   ```
 </details>