Previously we talked about reply Drupal node or comment with quote.
Drupal 7 – Quote post or comment on reply
By default, Drupal will make use of the beginning text of the comment body as the comment subject if it is not filled. This leads to a confusing subject title when using the Quote module. A workaround is to automate the comment subject title using the Re: Comment subjects module.
1. Download and install the module.
Reference: Drupal Module – Re: Comment subjects