diff --git a/package.json b/package.json
index 870c252..8b5e03d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "gmsm-sm2js",
-    "version": "0.7.1",
+    "version": "0.7.2",
     "description": "Pure Javascript implementation of the SM2/SM3/SM4 functions based on jsrsasign",
     "keywords": [
         "sm2",
diff --git a/src/sm2.js b/src/sm2.js
index d5eb067..c14efb0 100644
--- a/src/sm2.js
+++ b/src/sm2.js
@@ -400,6 +400,10 @@ class MessageDigest {
     }
   }
 
+  /**
+   * Finalizes the hash computation.
+   * @returns {Uint8Array} The digest of type Uint8Array
+   */
   digestRaw () {
     if (useNodeSM3) {
       const h = this.md.digest()
@@ -412,6 +416,11 @@ class MessageDigest {
     }
   }
 
+  /**
+   * Updates this hasher with a data and finalizes the hash computation.
+   * @param {string|Uint8Array} data the data to be appended
+   * @returns {string} The hex string of the digest
+   */
   digest (data) {
     if (data) {
       this.update(data)
@@ -427,6 +436,11 @@ class MessageDigest {
     }
   }
 
+  /**
+   * Updates this hasher with a hex string data and finalizes the hash computation.
+   * @param {string} hex the hex string data
+   * @returns {Uint8Array} The digest of type Uint8Array
+   */
   digestHex (hex) {
     this.updateHex(hex)
     return this.digest()