打算5月份到水牛城美加边境renew TN visa。
看到官方网站（http://travel.state.gov/visa/temp/types/types_1274.html#6）有如此要求：

Each applicant for a TN visa must adhere to the procedure as explained below:
* Online Nonimmigrant Visa Electronic Application, Form DS-160. Visit our DS-160 webpage to learn more about the DS-160 online process.
* A passport valid for travel to the U.S. and with a validity date at least six months beyond the applicant's intended period of stay in the U.S. (unless country-specific agreements provide exemptions).
* One (1) 2x2 photograph. See the required photo format explained in Photograph Requirements. A photograph is not required if you are applying in Mexico.
* Letter of Employment in the U.S.

去年8月办TN时只要求：雇主信（及TN support letter)，学位证和成绩单，加50多元。难道现在改要求了？
请最近去边境办TN的成功申请者赐教。多谢！