14.8.2.9 :comments

By default code blocks are tangled to source-code files without any insertion of comments beyond those which may already exist in the body of the code block. The :comments header argument can be set as follows to control the insertion of extra comments into the tangled code file.

• no The default. No extra comments are inserted during tangling.
• link The code block is wrapped in comments which contain pointers back to the original Org file from which the code was tangled.
• yes A synonym for “link” to maintain backwards compatibility.
• org Include text from the Org mode file as a comment. The text is picked from the leading context of the tangled code and is limited by the nearest headline or source block as the case may be.
• both Turns on both the “link” and “org” comment options.
• noweb Turns on the “link” comment option, and additionally wraps expanded noweb references in the code block body in link comments.