symfony
diff --git a/‎mailer.rst
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@@ -630,6 +630,8 @@ and it will select the appropriate certificate depending on the ``To`` option::
         // ...
         ->to('john@example.com');
 
+    // the second optional argument of SMimeEncrypter defines which encryption algorithm is used
+    // (it must be one of these constants: https://www.php.net/manual/en/openssl.ciphers.php)
     $encrypter = new SMimeEncrypter([
         // key = email recipient; value = path to the certificate file
         'jane@example.com' => '/path/to/first-certificate.crt',