diff --git a/README.md b/README.md
index 0dffb9abfe340ddbb7974ba32bd52bb4c69dc37a..df7221c02bbf17c5f42fcf1f931ba4c65f4463a4 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,39 @@
 # vk_u2f_gradle
 add gradle plugin into fido u2f applet from [vk_u2f](https://github.com/VivoKey/vk-u2f)
 
+## branch
+```
+v2 -> hkdf_chain
+v1 -> main
+```
+
+## dependency
+[passport applet](https://git.prlab.io/joshji/PassportAppletWithGradlePlugin)
+
+## build.gradle
+```groovy
+javacard{
+    config{
+        debugGpPro true
+        jckit jcdk_dir
+        cap{
+            .
+            .
+            .
+            dependencies{
+                local {// 這邊的路徑建議用絕對路徑，用相對路徑gradle找得到，但build的時候找不到
+                    exps 'C:\\Users\\josh2\\Documents\\GitLab\\EID\\Fido2Applet\\lib\\javacard\\applet.exp'
+                    jar 'C:\\Users\\josh2\\Documents\\GitLab\\EID\\Fido2Applet\\lib\\javacard\\applet.exp\\passport.jar'
+                }
+            }
+        }
+    }
+    .
+    .
+    .
+}
+```
+
 ## applet install
 
 1. open intelliJ by administrator