--- /dev/null
+# How to make configuable SDK extension
+
+1. Move the directory of configuarable SDK.
+$ cd config-sdk
+
+2. Make the list file of building-blocks of which the image consists.
+ex) network_audio_list.txt
+tizeniot_list.txt is full list of building-blocks.
+
+3. Build the SDK extension.
+Usage : make_extension.sh <buildingblock list file> <profile> <platform verion> <snapshot id>
+$ ./make_extension.sh network_audio_list.txt tznwaudio 5.0 20180509.1
+
+4. Output directory is ./extension
+ Output file is <profile>-<platform version>.zip
+
+# How to clean
+$ ./clean_data.sh