diff --git a/cryptomator/index.md b/cryptomator/index.md
index 2249efa9..ad10a2f5 100644
--- a/cryptomator/index.md
+++ b/cryptomator/index.md
@@ -74,6 +74,10 @@ Choose *File → New Vault…* to create a new vault.
 
 When _Preferences → Cryptomator → Auto detect and open vault in browser_ is enabled, opening a directory in the browser that is a Cryptomator Vault, a prompt is displayed to unlock the vault using the provided passphrase and decrypt the directory and filenames. If you cancel the prompt, the encrypted vault content is displayed.
 
+:::{note}
+A vault is only detected if `masterkey.cryptomator` or `vault.cryptomator` are found as one of the 10 files of the directory listing retrieved from the server.
+:::
+
 :::::{tabs}
 ::::{group-tab} macOS