diff --git a/openssl/src/pkey.rs b/openssl/src/pkey.rs
index 9f100075..8f7c4e4e 100644
--- a/openssl/src/pkey.rs
+++ b/openssl/src/pkey.rs
@@ -7,7 +7,7 @@
 //! encrypt information using a user's public key. The encrypted information can
 //! only be deciphered using that user's private key.
 //!
-//! This module offers support for four popular algorithms:
+//! This module offers support for five popular algorithms:
 //!
 //! * RSA
 //!
@@ -17,6 +17,8 @@
 //!
 //! * Elliptic Curves
 //!
+//! * HMAC
+//!
 //! These algorithms rely on hard mathematical problems - namely integer factorization,
 //! discrete logarithms, and elliptic curve relationships - that currently do not
 //! yield efficient solutions. This property ensures the security of these