diff --git a/README.md b/README.md
index f94ab5d..0b53deb 100644
--- a/README.md
+++ b/README.md
@@ -18,10 +18,10 @@
 [render](https://uwebzh.onrender.com/en/)
 )
 
-- Tiny: less than 200k
-- Fast: run fast, even with thousands of user provided css/scripts
+- Tiny: less than 200k.
+- Fast: run fast, even with thousands of user provided css/scripts.
 - Efficient: less touches, one click to reach any number of search engines without repeated input.
-- Convenient: any book (pdf/djvu)/dictionary (mdict)/txt/command line/app can be search engine.
+- Convenient: Any book (pdf/djvu)/dictionary (mdict)/txt/command line/app/webapp (web extensions) can be search engine.
 - Customizable: user-defined menus, (new) buttons and gestures for user agents, bookmarklets, url services, shell commands, internal functionality links and text processing etc.
 - Powerful: enabling html5 applications to work like native; javascript and shell scripting for general processing and more if enhanced by Termux.
 
diff --git a/README.zh-Hans.md b/README.zh-Hans.md
index c681b25..60c4218 100644
--- a/README.zh-Hans.md
+++ b/README.zh-Hans.md
@@ -19,6 +19,7 @@
 
 - 微：不到200K。
 - 威：支持使用js脚本、url服务、shell命令、内部功能链接定制菜单／（新）按钮／手势; html+js应用增强为本地应用。
+- 便捷：图书（pdf/djvu）/txt/词典（mdict,kiwix）/命令行/APP/webapp(web extensions)可作为搜索引擎使用。
 - 快：手机越慢，脚本插件越多越明显。
 - 高效：最少的操作。
 - 极致优化：
diff --git a/en/_posts/index.xml b/en/_posts/index.xml
index cacc8bf..2f490d6 100644
--- a/en/_posts/index.xml
+++ b/en/_posts/index.xml
@@ -12,8 +12,9 @@
       <pubDate>Thu, 20 Oct 2022 00:00:00 +0000</pubDate>
       
       <guid>/en/offlinecache/</guid>
-      <description>Offline resources locate in the folder &amp;quot;sitecache&amp;quot;. With the option &amp;quot;use offline resources&amp;quot; enabled, the corresponding files in &amp;quot;sitecache/[domain name]/[full path including filename, &#39;?&#39; , &#39;&amp;amp;&#39; , &#39;=&#39;. exactly as url]&amp;quot; are loaded first before reaching the network.
-PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp;amp; .xpi for firefox) are just packaged websites. Ex. the &amp;quot;kiwix&amp;quot; extension can be extracted to the folder &amp;quot;sitecache/kiwix&amp;quot;, then the kiwix extension can be accessed via url &amp;quot;https://kiwix/www/index.</description>
+      <description>Click to install url service that extracts web apps to the folder &amp;quot;sitecache/local/&amp;quot;: support web extensions (.crx for chrome &amp;amp; .xpi for firefox).
+Offline resources locate in the folder &amp;quot;sitecache&amp;quot;. With the option &amp;quot;use offline resources&amp;quot; enabled, the corresponding files in &amp;quot;sitecache/[domain name]/[full path including filename, &#39;?&#39; , &#39;&amp;amp;&#39; , &#39;=&#39;. exactly as url]&amp;quot; are loaded first before reaching the network.
+PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp;amp; .</description>
     </item>
     
     <item>
diff --git a/en/html5/index.html b/en/html5/index.html
index 6ccfd98..088c2e0 100644
--- a/en/html5/index.html
+++ b/en/html5/index.html
@@ -62,7 +62,7 @@ Click to install the following html5 apps:<br>
 <p>The following mentioned subfolders locate in the configuration folder.</p>
 <ul>
 <li>
-<p>The following html5 applications are allowed to read local files referred by &quot;https://local/sdcard/...&quot; where the &quot;/sdcard/..&quot; part is the full path of the file. The below applications <span style="color:red">can auto choosed any files as file objects</span>.</p>
+<p>The following html5 applications are allowed to read local files referred by &quot;https://local/sdcard/...&quot; where the &quot;/sdcard/..&quot; part is the full path of the file. The below applications <span style="color:red">can auto choose any files as file objects</span>.</p>
 <ul>
 <li>Locating in a subfolder whose name begins with &quot;app&quot; (such as &quot;appPDF&quot;)</li>
 <li>&quot;https://local/...&quot; applications (only possible with the option &quot;<a href="../offlinecache/index.html">use offline resources</a>&quot; and installed under the folder &quot;sitecache/local/&quot;)</li>
diff --git a/en/index.xml b/en/index.xml
index b2d8f56..588d957 100644
--- a/en/index.xml
+++ b/en/index.xml
@@ -12,8 +12,9 @@
       <pubDate>Thu, 20 Oct 2022 00:00:00 +0000</pubDate>
       
       <guid>/en/offlinecache/</guid>
-      <description>Offline resources locate in the folder &amp;quot;sitecache&amp;quot;. With the option &amp;quot;use offline resources&amp;quot; enabled, the corresponding files in &amp;quot;sitecache/[domain name]/[full path including filename, &#39;?&#39; , &#39;&amp;amp;&#39; , &#39;=&#39;. exactly as url]&amp;quot; are loaded first before reaching the network.
-PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp;amp; .xpi for firefox) are just packaged websites. Ex. the &amp;quot;kiwix&amp;quot; extension can be extracted to the folder &amp;quot;sitecache/kiwix&amp;quot;, then the kiwix extension can be accessed via url &amp;quot;https://kiwix/www/index.</description>
+      <description>Click to install url service that extracts web apps to the folder &amp;quot;sitecache/local/&amp;quot;: support web extensions (.crx for chrome &amp;amp; .xpi for firefox).
+Offline resources locate in the folder &amp;quot;sitecache&amp;quot;. With the option &amp;quot;use offline resources&amp;quot; enabled, the corresponding files in &amp;quot;sitecache/[domain name]/[full path including filename, &#39;?&#39; , &#39;&amp;amp;&#39; , &#39;=&#39;. exactly as url]&amp;quot; are loaded first before reaching the network.
+PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp;amp; .</description>
     </item>
     
     <item>
diff --git a/en/links/index.html b/en/links/index.html
index 7c44650..7d53e5c 100644
--- a/en/links/index.html
+++ b/en/links/index.html
@@ -98,8 +98,14 @@ Socks proxy</p>
 </ul>
 <h3 id="i-internal-links">&quot;i:&quot; internal links:</h3>
 <ul>
-<li>i:0m[bookmarklet index|prefix|?postfix|c[cssFlag]]:[url]<br>
-Visiting url and execute the uweb browser internal bookmarklet that keeps valid for all urls under the path of [url].</li>
+<li>
+<p>i:0b[path]:[url]<br>
+Extract remote content (tar/tgz/zip) under the folder [path]. If [path] ends with &quot;/&quot;, then put unzipped file under the folder &quot;[path]/[file name stem]&quot; (for zipped files only, not for tar/tgz).</p>
+</li>
+<li>
+<p>i:0m[bookmarklet index|prefix|?postfix|c[cssFlag]]:[url]<br>
+Visiting url and execute the uweb browser internal bookmarklet that keeps valid for all urls under the path of [url].</p>
+</li>
 <li></li>
 </ul>
 <p>[bookmarklet index] must have two/three digits. The first two digits are used as index of bootmarklet. For example, &quot;00&quot; as the first local bookmarklet; &quot;01&quot; as the first remote script; then &quot;02&quot; as the second local bookmarklet, ... The third digit is uplevel, 1 to make bookmarklet valid for parent path of [url].</p>
diff --git a/en/offlinecache/index.html b/en/offlinecache/index.html
index 3a8ee4f..6923db4 100644
--- a/en/offlinecache/index.html
+++ b/en/offlinecache/index.html
@@ -47,8 +47,9 @@
   <ul class="tags">
     
   </ul>
-  <p>Offline resources locate in the folder &quot;sitecache&quot;. With the option &quot;use offline resources&quot; enabled, the corresponding files in &quot;sitecache/[domain name]/[full path including filename, '?' , '&amp;' , '='. exactly as url]&quot; are loaded first before reaching the network.</p>
-<p>PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp; .xpi for firefox) are just packaged websites. Ex. the &quot;kiwix&quot; extension can be extracted to the folder &quot;sitecache/kiwix&quot;, then the kiwix extension can be accessed via url &quot;https://kiwix/www/index.html&quot; in the browser. Note: the folder name &quot;kiwix&quot; is used as the domain name in the url.</p>
+  <p><a href="i:01Extract webapp:i:0bsitecache/local/:">Click to install url service that extracts web apps to the folder &quot;sitecache/local/&quot;</a>: support web extensions (.crx for chrome &amp; .xpi for firefox).</p>
+<p>Offline resources locate in the folder &quot;sitecache&quot;. With the option &quot;use offline resources&quot; enabled, the corresponding files in &quot;sitecache/[domain name]/[full path including filename, '?' , '&amp;' , '='. exactly as url]&quot; are loaded first before reaching the network.</p>
+<p>PWAs (Progresssive Web Applications) and some web extensions (.crx for chrome &amp; .xpi for firefox) are just packaged websites. Ex. the &quot;kiwix&quot; extension can be extracted to the folder &quot;sitecache/local/kiwix&quot;, then the kiwix extension can be accessed via url &quot;https://local/kiwix/www/index.html&quot; in the browser. Note: the folder name &quot;local&quot; is used as the domain name in the url.</p>
 
 </div>
 
diff --git a/index.html b/index.html
index db7d507..33185bf 100644
--- a/index.html
+++ b/index.html
@@ -1 +1,10 @@
-<meta http-equiv="refresh" content="0; url=en/index.html">
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>en/</title>
+    <link rel="canonical" href="en/">
+    <meta name="robots" content="noindex">
+    <meta charset="utf-8">
+    <meta http-equiv="refresh" content="0; url=en/">
+  </head>
+</html>