}
        final String suffix = "\n[Referenced documents: " + titles + "]";
        if (suffix.length() <= maxSuffixLength) {
            return suffix;
        }
        if (maxSuffixLength <= 0) {
            return "";
        }
        return suffix.substring(0, maxSuffixLength);
    }

    private static final int MAX_QUERY_LENGTH = 1000;