Added a comment pointing out the behaviour of "openssl x509 -conf ...",

oid_file		= $ENV::HOME/.oid

oid_section		= new_oids

# To use this configuration file with the "-config" option of the

# "openssl x509" utility, name here the section containing the

# X.509v3 extensions to use:

# extensions		= 

# (Alternatively, use a configuration file that has only

# X.509v3 extensions in its main [= default] section.)

[ new_oids ]

# We can add new OIDs in here for use by 'ca' and 'req'.