diff --git a/src/spec.rs b/src/spec.rs
index 4ca9d42..6303ff9 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -65,16 +65,22 @@ pub struct TinyEncryptEnvelop {
 /// NOTICE: Kms and Age is not being supported in the future
 #[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq, PartialOrd)]
 pub enum TinyEncryptEnvelopType {
+    // OpenPGP RSA
     #[serde(rename = "pgp")]
     Pgp,
+    // OpenPGP X25519
     #[serde(rename = "pgp-x25519")]
     PgpX25519,
+    // Age, tiny-encrypt-rs is not supported
     #[serde(rename = "age")]
     Age,
+    // ECDH P256
     #[serde(rename = "ecdh")]
     Ecdh,
+    // ECDH P384
     #[serde(rename = "ecdh-p384")]
     EcdhP384,
+    // KMS, tiny-encrypt-rs is not supported
     #[serde(rename = "kms")]
     Kms,
 }