diff --git a/README.md b/README.md
index 3184531..4c71b4a 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ Multi purpose cross-platform cryptography tool for asymmetric/symmetric encrypti
 * Recusive Hash Digest + Check 
 * CMAC (Cipher-based message authentication code)
 * HMAC (Hash-based message authentication code)
+* HKDF (HMAC-based key derivation function)
 * PBKDF2 (Password-based key derivation function 2)
 * TLS 1.2 (Transport Layer Security)