@@ -1,10 +1,14 @@
-
 # Changelog
 
+
+## 3.7.1 / 2017-05-19
+
+  * fix: docsify-updated is undefined
+
 ## 3.7.0 / 2017-05-16
 
-  * feat: add externalLinkTarget, close #149
-  * feat: add **{docsify-updated<span>}</span>**, close #158
+  * feat: add externalLinkTarget, close ([#149](https://github.com/QingWei-Li/docsify/issues/149)
+  * feat: add **{docsify-updated<span>}</span>**, close ([#158](https://github.com/QingWei-Li/docsify/issues/158)
 
 ## 3.6.6 / 2017-05-06
 
@@ -25,7 +29,7 @@
 ## 3.6.2/ 2017-04-12
 
   * feat(external-script): detect more than one script dom, fixed ([#146](https://github.com/QingWei-Li/docsify/issues/146)
-  * GA: Send hash instead of complete href (#147)
+  * GA: Send hash instead of complete href ([#147](https://github.com/QingWei-Li/docsify/issues/147)
 
 ## 3.6.1 / 2017-04-09
 
 
@@ -1,6 +1,6 @@
 ![logo](_media/icon.svg)
 
-# docsify <small>3.6</small>
+# docsify <small>3.7</small>
 
 > A magical documentation site generator.
 
 
@@ -666,7 +666,8 @@ function get (url, hasBar) {
           var result = cache[url] = {
             content: target.response,
             opt: {
-              updatedAt: xhr.getResponseHeader('last-modified')
+              updatedAt: xhr.getResponseHeader('last-modified') ||
+                xhr.getResponseHeader('expires')
             }
           };
 
@@ -3273,10 +3274,13 @@ function renderMixin (proto) {
 
   proto._renderMain = function (text, opt) {
     var this$1 = this;
+    if ( opt === void 0 ) opt = {};
 
     callHook(this, 'beforeEach', text, function (result) {
       var html = this$1.isHTML ? result : markdown(result);
-      html = formatUpdated(html, opt.updatedAt, this$1.config.formatUpdated);
+      if (opt.updatedAt) {
+        html = formatUpdated(html, opt.updatedAt, this$1.config.formatUpdated);
+      }
 
       callHook(this$1, 'afterEach', html, function (text) { return renderMain.call(this$1, text); });
     });