listener.ora changes

Hello gurus,since i added databases and listeners to restart configuration, my listener.ora (from oracle environment, not grid environment) changed.
All entries like
LISTASD2IN =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1524))
    )
  )
SUBSCRIBE_FOR_NODE_DOWN_EVENT_LISTASD2IN=OFF
LOG_DIRECTORY_LISTASD2IN=/fm/ASD2IN/ora/admin/listeners
DIAG_ADR_ENABLED_LISTASD2IN       =off
SID_LIST_LISTASD2IN=
  (SID_LIST =
  (SID_DESC =
  (GLOBAL_DBNAME = ASD2IN)
  (ORACLE_HOME = /appl/oracle/ora11203)
  (SID_NAME = ASD2IN)
  (ENVS = 'TZ=MET-1METDST')
 )
)

became :

LISTASD2IN=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTASD2IN))))                # line added by Agent