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diff --git a/readme.md b/readme.md
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@@ -7,9 +7,11 @@ Sensitive data is not stored on the disk when containers start. It is copied int
 ## Requirements
 
 - `docker`
+- `certbot`
 - `mkcert`
 - `htpasswd`
 - `tar`
+- `zstd`
 
 ## How-to