After the patent application is submitted, can it be amended?

Can the patent application documents be amended after submission? According to the provisions of the patent law, the applicant can modify the patent application documents after they are submitted. An applicant for a patent for invention may, within three months after making a request for substantive examination or issuing a notice in China National Intellectual Property Administration that the application for a patent for invention has entered the substantive examination stage, voluntarily propose amendments to its application for a patent for invention. An applicant for a patent for utility model or design may modify the application documents within two months from the date of patent application.