diff --git a/source/amebad/API_Documents/OTA/Class OTA.rst b/source/amebad/API_Documents/OTA/Class OTA.rst
new file mode 100644
index 0000000..25e0d43
--- /dev/null
+++ b/source/amebad/API_Documents/OTA/Class OTA.rst	
@@ -0,0 +1,105 @@
+Class OTA
+=========
+
+.. contents::
+  :local:
+  :depth: 2
+
+**OTA Class**
+-------------
+
+**Description**
+~~~~~~~~~~~~~~~
+
+A class used for updating firmware Over the Air (OTA) in local area network.
+
+**Syntax**
+~~~~~~~~~~
+
+.. code-block:: c++
+
+    class OTA
+
+**Members**
+~~~~~~~~~~~
+
++------------------------------------------+-------------------------------------------------+
+| **Public Constructors**                                                                    |
++==========================================+=================================================+
+| A public constructor should not be used as this class is intended to be a singleton class. |
+| Access member functions using the object instance named OTA.                               |
++------------------------------------------+-------------------------------------------------+
+| **Public Methods**                                                                         |
++------------------------------------------+-------------------------------------------------+
+| OTA::beginOTA                            | Starts to connect to MDNS OTA server            |
+|                                          | and receive the new firmware.                   |
+|                                          |                                                 |
++------------------------------------------+-------------------------------------------------+
+| OTA::start_OTA_threads                   | Starts multithreading tasks to connect          |
+|                                          | to HTTP OTA server and receive new firmware     |
+|                                          | upon triggered.                                 |
++------------------------------------------+-------------------------------------------------+
+
+**OTA::beginOTA**
+-----------------
+
+**Description**
+~~~~~~~~~~~~~~~
+
+Starts the connect of OTA server and waiting to receive the new OTA firmware sending from the OTA client via TCP socket.
+
+**Syntax**
+~~~~~~~~~~
+
+.. code-block:: c++
+
+    void beginOTA(int port);
+
+**Parameters**
+~~~~~~~~~~~~~~
+
+port: port number for the OTA MDNS IP address, default port address is 8082.
+
+**Returns**
+~~~~~~~~~~~
+
+NA
+
+**Example Code**
+~~~~~~~~~~~~~~~~
+
+Example: `OTA_Basic <https://github.com/Ameba-AIoT/ameba-arduino-d/blob/dev/Arduino_package/hardware/libraries/OTA/examples/OTA_Basic/OTA_Basic.ino>`_
+
+.. note :: Configures and registers the MDNS service required for the Arduino IDE to discover and recognize Ameba OTA. "OTA.h" must be included to use the class function.
+
+**OTA::start_OTA_threads**
+--------------------------
+
+**Description**
+~~~~~~~~~~~~~~~
+
+Starts the connect of OTA server and waiting to receive the new OTA firmware sending from the OTA client via TCP socket.
+
+**Syntax**
+~~~~~~~~~~
+
+.. code-block:: c++
+
+    void start_OTA_threads(int port, char *server);
+
+**Parameters**
+~~~~~~~~~~~~~~
+
+port: port number for the OTA HTTP server IP address, default port address is 3000.
+
+\*server: pointer for OTA HTTP server IP address. 
+
+**Returns**
+~~~~~~~~~~~
+
+NA
+
+**Example Code**
+~~~~~~~~~~~~~~~~
+
+Example: `OTA_Http <https://github.com/Ameba-AIoT/ameba-arduino-d/blob/dev/Arduino_package/hardware/libraries/OTA/examples/OTA_Http/OTA_Http.ino>`_
diff --git a/source/amebad/API_Documents/OTA/index.rst b/source/amebad/API_Documents/OTA/index.rst
new file mode 100644
index 0000000..25cd22a
--- /dev/null
+++ b/source/amebad/API_Documents/OTA/index.rst
@@ -0,0 +1,7 @@
+OTA
+===
+
+.. toctree::
+   :maxdepth: 1
+
+   Class OTA
\ No newline at end of file
diff --git a/source/amebad/API_Documents/index.rst b/source/amebad/API_Documents/index.rst
new file mode 100644
index 0000000..ebc4501
--- /dev/null
+++ b/source/amebad/API_Documents/index.rst
@@ -0,0 +1,7 @@
+API Documents
+=============
+
+.. toctree::
+   :maxdepth: 1
+
+   OTA/index
\ No newline at end of file
diff --git a/source/amebad/index.rst b/source/amebad/index.rst
index abf6d81..320e0c0 100644
--- a/source/amebad/index.rst
+++ b/source/amebad/index.rst
@@ -6,6 +6,7 @@ AmebaD Arduino
    :maxdepth: 2
 
    Example_Guides/index
+   API_Documents/index
 
 SDK Source Code
 ---------------