-.PP
-If any of the files
-.IR localhosts ,
-.IR localnetworks ,
-or
-.I localgateways
-are present in the current directory,
-the file's contents is prepended to the
-output file.
-Of these, only the gateways file is interpreted.
-This allows sites to maintain local aliases and
-entries which are not normally present in the
-master database.
-Only one gateway to each network will be placed in the gateways file;
-a gateway listed in the localgateways file will override any in the
-input file.
-.PP