Add a README entry about locally-defined options.

diff --git a/README b/README
index 38ba96ccd087301ee7f29d5a0905af02d941542c..cf6ca6f6dad52f4cd94185f25d06263366f49fdb 100644 (file)
--- a/README
+++ b/README
@@ -15,6 +15,7 @@ the ISC DHCP Distribution.
         3.1     UNPACKING IT
         3.2     CONFIGURING IT
          3.2.1   DYNAMIC DNS UPDATES
+         3.2.2   LOCALLY DEFINED OPTIONS
         3.3     BUILDING IT
        4       INSTALLING THE DHCP DISTRIBUTION
        5       USING THE DHCP DISTRIBUTION
@@ -169,6 +170,16 @@ There is documentation for the DDNS support in the dhcpd.conf manual
 page - see the beginning of this document for information on finding
 manual pages.
 
+                      LOCALLY DEFINED OPTIONS
+
+In previous versions of the DHCP server there was a mechanism whereby
+options that were not known by the server could be configured using
+a name made up of the option code number and an identifier:
+"option-nnn"   This is no longer supported, because it is not future-
+proof.   Instead, if you want to use an option that the server doesn't
+know about, you must explicitly define it using the method described
+in the dhcp-options man page under the DEFINING NEW OPTIONS heading.
+
                             BUILDING IT
 
 Once you've run configure, just type ``make'', and after a while