diff -r 65965da01c41 -r 748fa1b80031 plugins/Yubikey.php
--- a/plugins/Yubikey.php	Mon Mar 02 10:56:51 2009 -0500
+++ b/plugins/Yubikey.php	Sun Mar 08 00:45:45 2009 -0500
@@ -117,6 +117,7 @@
         err_missing_api_key: 'Your OTP could not be validated because no Yubico API key is registered on this site.',
         err_http_response_error: 'Your OTP could not be validated because the Yubico authentication server reported an error.',
         err_malformed_response: 'Your OTP could not be validated because the Yubico authentication server returned an unexpected response.',
+        err_timestamp_check_failed: 'Your OTP could not be validated because the timestamp of the response from the Yubico authentication server was out of bounds.',
         err_response_missing_sig: 'Your OTP could not be validated because the Yubico authentication server did not sign its response.',
         err_response_invalid_sig: 'Your OTP could not be validated because the signature of the authentication response was invalid.',
         err_response_missing_status: '%this.yubiauth_err_malformed_response%',