Adds a comment to explain why no output
Adds a comment to explain why no output

Signed-off-by: Marc Lasson <367bbdfafbbc1a3248435237fe8f192500cc470e@lexifi.com>

janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,dra27/jbuilder