In order to add comments to a YAML file, you simply have to use the # (hashtag symbol) at the start of the line. For example, below is an example of one commented line in a YAML file.
# This is an example of one commented line in a YAML file How to Add Block Comments to YAML File?
If you would like to comment multiple lines in a YAML file, you simple have to start each commented line with a # (hashtag). See the following block comment as an example:
# This is an example of
# a block comment
# in a YAML file