diff --git a/README.md b/README.md
index 100b3e5..ad8b5fb 100644
--- a/README.md
+++ b/README.md
@@ -48,11 +48,13 @@ specifics for everything
 
 ### caddy
 
-todo
+> [!NOTE]
+> **todo** // detail setup
 
 ### stalwart
 
-**initial setup**
+<details>
+    <summary>initial setup</summary>
 
 1. server identity
     - server hostname: `mail.yaoi.dog`
@@ -69,8 +71,10 @@ todo
 5. automatic dns management
     - dns server type: `porkbun`
     - description: `porkbun`
+</details>
 
-**further setup**
+<details>
+    <summary>further setup</summary>
 
 - settings -> security -> allowed ips
   - added `172.18.0.0/24`; reason: `internal`
@@ -84,24 +88,31 @@ todo
     - signature algorithm: `ECDSA using P-384 and SHA-384`
     - signature key: `secret read from environment variable`
     - variable name: `OIDC_SIGNATURE_KEY`
+</details>
 
-**useful links**
+<details>
+    <summary>useful links</summary>
 
 - https://stalw.art/docs
 - https://testconnectivity.microsoft.com/tests/Imap/input
 - https://mail-tester.com
+</details>
 
 ### bulwark
 
-todo
+> [!NOTE]
+> **todo** // detail setup
 
-**useful links**
+<details>
+    <summary>useful links</summary>
 
 - https://bulwarkmail.org/docs
+</details>
 
 ### gitea
 
-**initial setup**
+<details>
+    <summary>initial setup</summary>
 
 - database settings
   - database type: `sqlite3`
@@ -126,7 +137,7 @@ todo
   - enable openid self-registration: `true`
   - hidden email domain: `git.yaoi.dog`
   - password hash algorithm: `argon2`
-
+</details>
 
 ## backups