Update to the CTP:
For texts which have a corresponding commentary in the CTP database (currently the Analects, Mengzi, Zhongyong, Daxue, and Mozi), it is now possible to display the commentary for any paragraph of text by clicking on the 注 icon beside a paragraph of the uncommented text. Currently available commentaries are 朱熹’s 四書章句集注 and 孫詒讓’s 墨子閒詁.