Comments that only appear in the markdown document

• From here
• It may be prudent to insert a blank line before and after this type of comments, because some Markdown parsers may not like link definitions brushing up against regular text.

[comment]: <> (This is a comment, it will not be included)

or

[//]: <> (This is also a comment.)

or

[//]: # (This may be the most platform independent comment)