diff --git a/TinyEncryptSpecV1.1.md b/TinyEncryptSpecV1.1.md
index 2696c1a..82f6e21 100644
--- a/TinyEncryptSpecV1.1.md
+++ b/TinyEncryptSpecV1.1.md
@@ -33,8 +33,9 @@ Meta format:
 
 Envelop format:
 
-| Field        | Type   | Comment                |
-|--------------|--------|------------------------|
-| type         | String | `kms`, `pgp`, ...      |
-| kid          | String | Key ID                 |
-| encryptedKey | String | `base64` Encrypted Key |
\ No newline at end of file
+| Field        | Type   | Comment                  |
+|--------------|--------|--------------------------|
+| type         | String | `kms`, `pgp`, ...        |
+| kid          | String | Key ID                   |
+| desc         | String | \[Optional\] Description |
+| encryptedKey | String | `base64` Encrypted Key   |
\ No newline at end of file