diff --git a/README.md b/README.md
index 43d0d20..4e48e73 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,19 @@
 
 utilities for SYMPA
 
-## usage
+## requirements
 
-* # prepend by `sudo`
-* sudo bin/purge.bash
+1. command `sudo`
+1. current user in group sudo
+
+## install (debian12)
+
+* debian/install.bash
+    * debian/install_zourit_style.bash # specific for [zourit](https://zourit.net)
+
+## usage 
+
+* bin/purge.bash
+* bin/export.bash
+* bin/import.bash
+  * bin/apply_auth_remote_ssh.bash # specific for [zourit](https://zourit.net) and artcode