diff --git a/pool/page_2fa.php b/pool/page_2fa.php
index 530c9346..7648bd12 100644
--- a/pool/page_2fa.php
+++ b/pool/page_2fa.php
@@ -103,6 +103,8 @@ function set_2fa($data, $user, $tfa, $ans, $err)
$pg .= 'Your 2FA device would be, for example, your phone or tablet.
';
$pg .= 'Each time you need a 2FA code, you use your device to generate a number
';
$pg .= 'that you type into the "*2nd Authentication:" field on any page that has it.
';
+ $pg .= 'IMPORTANT: the TOTP algorithm uses the time on your device,
';
+ $pg .= "so it is important that your device's clock is accurate within a few seconds.
";
$pg .= 'WARNING: once you have successfully tested and enabled 2FA,
';
$pg .= 'you will be unable to access or even reset your account without 2FA.
';
$pg .= 'There is no option to recover your 2FA from the web site,
';