diff --git a/readme.md b/readme.md
index 05a3540..3e1ae4c 100644
--- a/readme.md
+++ b/readme.md
@@ -10,4 +10,11 @@ This will give you :
 
 [Visit the Bitcoin Wiki](https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses)
 
+This is a demo, it uses Legacy Bitcoin addresses, which start with a 1 for P2PKH (Pay-to-Public-Key-Hash) addresses.
+Address Formats in Bitcoin
 
+    Legacy Addresses (Base58Check):
+        Format: Starts with 1.
+        Example: 1PMycacnJaSqwwJqjawXBErnLsZ7RkXUAs.
+        Encoding: Base58Check encoding.
+        Type: P2PKH (Pay-to-Public-Key-Hash).