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@@ -13,10 +13,18 @@ pcb-tools-extension adds following function  to pcb-tools.
 Only RS-274x format and Excellon drill format data can be handled by current version of this library.
 
 ## Installation
+You can install a stable version by following step.
+
 ```shell
 $ pip install pcb-tools-extension
 ```
 
+If you have a intention to try latest developing version, please install as follows.
+
+```shell
+$ pip install git+https://github.com/opiopan/pcb-tools-extension.git
+```
+
 ## How to panelize
 Following code is a example to panelize two top metal layer files.