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 <p>​ </p><h1>Source</h1>
 <p>Latest source code can be download at <a href="https://github.com/itead/ITEADLIB_Arduino_Nextion">https://github.com/itead/ITEADLIB_Arduino_Nextion</a>.</p>
 <p>You can clone it by: </p><pre class="fragment">git clone https://github.com/itead/ITEADLIB_Arduino_Nextion
-</pre><h1>Hareware requirement</h1>
+</pre> <h1>Documentation</h1>
+<p>Online API documentation can be reached at <a href="http://docs.iteadstudio.com/ITEADLIB_Arduino_Nextion/">http://docs.iteadstudio.com/ITEADLIB_Arduino_Nextion/</a>.</p>
+<p>Offline API documentation can be found under directory <a href="https://github.com/itead/ITEADLIB_Arduino_Nextion/tree/master/doc">doc</a>.</p>
+<h1>Hareware requirement</h1>
 <ul>
 <li>RAM: not less than 2KBytes</li>
 <li>Serial: two serial (communication and debug)</li>
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 <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;You can clone it by:</div>
 <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>
 <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    git clone https:<span class="comment">//github.com/itead/ITEADLIB_Arduino_Nextion</span></div>
-<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>
-<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor"># Hareware requirement </span></div>
+<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor"># Documentation</span></div>
+<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;Online API documentation can be reached at &lt;http:<span class="comment">//docs.iteadstudio.com/ITEADLIB_Arduino_Nextion/&gt;.</span></div>
 <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
-<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  - RAM: not less than 2KBytes</div>
-<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;  - Serial: two serial (communication and debug)</div>
+<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;Offline API documentation can be found under directory </div>
+<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;[doc](https:<span class="comment">//github.com/itead/ITEADLIB_Arduino_Nextion/tree/master/doc).</span></div>
 <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
-<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor"># Suppported Mainboards:</span></div>
+<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor"># Hareware requirement </span></div>
 <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
-<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  - Iteaduino MEGA2560</div>
-<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  - Arduino MEGA2560</div>
+<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;  - RAM: not less than 2KBytes</div>
+<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;  - Serial: two serial (communication and debug)</div>
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-<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;</div>
-<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160; DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE </div>
-<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        Version 2, December 2004 </div>
-<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
-<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160; Copyright (C) 2014 ITEAD Studio</div>
+<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor"># Suppported Mainboards:</span></div>
+<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
+<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;  - Iteaduino MEGA2560</div>
+<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;  - Arduino MEGA2560</div>
+<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
+<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div>
+<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;-------------------------------------------------------------------------------</div>
+<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
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-<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        </div>
-<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION </div>
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-<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;  0. You just DO WHAT THE FUCK YOU WANT TO.</div>
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-<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;-------------------------------------------------------------------------------</div>
+<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE </div>
+<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        Version 2, December 2004 </div>
+<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;</div>
+<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160; Copyright (C) 2014 ITEAD Studio</div>
+<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
+<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160; Everyone is permitted to copy and distribute verbatim or modified </div>
+<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160; copies of <span class="keyword">this</span> license document, and changing it is allowed as <span class="keywordtype">long</span> </div>
+<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160; as the name is changed. </div>
+<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div>
+<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE </div>
+<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;        </div>
+<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION </div>
+<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
+<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;  0. You just DO WHAT THE FUCK YOU WANT TO.</div>
+<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div>
+<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
+<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;-------------------------------------------------------------------------------</div>
 </div><!-- fragment --></div><!-- contents -->
 <!-- start footer part -->
 <hr class="footer"/><address class="footer"><small>
-Generated on Thu Jul 16 2015 10:59:03 for API by &#160;<a href="http://www.doxygen.org/index.html">
+Generated on Thu Jul 16 2015 13:05:45 for API by &#160;<a href="http://www.doxygen.org/index.html">
 <img class="footer" src="doxygen.png" alt="doxygen"/>
 </a> 1.8.7
 </small></address>
diff --git a/doc/API.chm b/doc/API.chm
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diff --git a/doc/ITEAD-logo.JPG b/doc/ITEAD-logo.JPG
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diff --git a/readme.md b/readme.md
index 60c907a..34ec64f 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-@mainpage
+@mainpage
 
 # Nextion Library for Arduino 
 
@@ -20,6 +20,11 @@ Latest source code can be download at https://github.com/itead/ITEADLIB_Arduino_
 You can clone it by:
 
     git clone https://github.com/itead/ITEADLIB_Arduino_Nextion
+# Documentation
+Online API documentation can be reached at <http://docs.iteadstudio.com/ITEADLIB_Arduino_Nextion/>.
+
+Offline API documentation can be found under directory 
+[doc](https://github.com/itead/ITEADLIB_Arduino_Nextion/tree/master/doc).
 
 # Hareware requirement