diff --git a/apps/playground/src/helpers/mail-files.ts b/apps/playground/src/helpers/mail-files.ts
index 0b9271d..01cc915 100644
--- a/apps/playground/src/helpers/mail-files.ts
+++ b/apps/playground/src/helpers/mail-files.ts
@@ -2,7 +2,7 @@ const packageJson = {
   name: 'demo',
   private: true,
   dependencies: {
-    '@music163/tango-mail': '0.1.1',
+    '@music163/tango-mail': '0.2.4',
     '@music163/tango-boot': '0.2.5',
     react: '17.0.2',
     'react-dom': '17.0.2',
@@ -44,7 +44,7 @@ const tangoConfigJson = {
     },
     '@music163/tango-mail': {
       description: 'TangoMail 基础物料',
-      version: '0.1.1',
+      version: '0.2.4',
       library: 'TangoMail',
       type: 'baseDependency',
       resources: ['https://unpkg.com/@music163/tango-mail@{{version}}/dist/index.js'],
@@ -116,7 +116,6 @@ const WelcomeEmail = () => (
         </Section>
         <Text style={paragraph}>
           Best,
-          <br />
           The Koala team
         </Text>
         <Hr style={hr} />
diff --git a/packages/core/src/helpers/ast/parse.ts b/packages/core/src/helpers/ast/parse.ts
index 5955b64..02ec0ad 100644
--- a/packages/core/src/helpers/ast/parse.ts
+++ b/packages/core/src/helpers/ast/parse.ts
@@ -222,15 +222,16 @@ export function value2jsxAttributeValueNode(value: any) {
   return ret;
 }
 
-// TODO: 待校验
 export function value2jsxChildrenValueNode(value: any) {
   let ret: t.JSXElement | t.JSXFragment | t.JSXExpressionContainer | t.JSXSpreadChild | t.JSXText;
   switch (typeof value) {
     case 'string':
-      if (isValidExpressionCode(value)) {
+      if (isWrappedCode(value)) {
+        // 代码模式
         const innerString = getVariableContent(value);
         ret = t.jsxExpressionContainer(code2expression(innerString));
       } else {
+        // 普通的文本
         ret = t.jsxText(value);
       }
       break;
diff --git a/packages/core/src/helpers/ast/traverse.ts b/packages/core/src/helpers/ast/traverse.ts
index 37c010f..8eaadc3 100644
--- a/packages/core/src/helpers/ast/traverse.ts
+++ b/packages/core/src/helpers/ast/traverse.ts
@@ -391,8 +391,10 @@ export function updateJSXElementAttribute(node: t.JSXElement, attrName: string,
         isExist = true;
         // @ts-ignore
         if (t.isJSXAttribute(jsxAttributeNode)) {
+          // 更新 jsx 属性值 <Foo bar="1" /> 的模式
           jsxAttributeNode.value = value2jsxAttributeValueNode(attrValue);
         } else if (name === 'children') {
+          // 更新 jsx children 的情况 <Foo>children</Foo>
           node.children = value2jsxChildrenValueNode(attrValue);
         }
       }