This feature lets you engage in collaborative discussions directly within your content entries. It addresses feedback, clarifies doubts, or continues conversations, ensuring smoother content reviews and updates.
To reply to a comment, log in to your Contentstack account, and perform the following steps:
Open an entry with comments, click the “Comment” icon next to the relevant field, and enter your comments in the textbox. 
Note: The maximum length of a comment is 500 characters.
Additional Resource: Refer to our JSON RTE comments document to manage comments within the JSON Rich Text Editor.