Regulations Governing Licences and Ratings for Airmen Article 11

Where the holder of an airman certificate is subject to specific operational limitation, level of English proficiency for radiotelephony communication, restricted to conducting flight instruction within flight simulation training devices, or other limitations determined necessary by the CAA, the CAA may annotate such limitations on the airman certificate.
中文原文 航空人員檢定給證管理規則第11條
航空人員檢定證持有人有特定操作限制、無線電溝通英語專業能力、限制於飛航模擬訓練設備內從事飛航教學或其他經民航局認定需要者,民航局得於其檢定證註記。

English translation for reference only; the Chinese text prevails. Not legal advice.