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-rw-r--r--doc/README.developer8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/README.developer b/doc/README.developer
index 3cb73d60fd..09dc5838fe 100644
--- a/doc/README.developer
+++ b/doc/README.developer
@@ -3241,6 +3241,14 @@ This will create preferences "beep.tcp.port" and
"beep.strict_header_terminator", the first of which is an unsigned
integer and the second of which is a Boolean.
+Note that a warning will pop up if you've saved such preference to the
+preference file and you subsequently take the code out. The way to make
+a preference obsolete is to register it as such:
+
+/* Register a preference that used to be supported but no longer is. */
+ void prefs_register_obsolete_preference(module_t *module,
+ const char *name);
+
2.7 Reassembly/desegmentation for protocols running atop TCP.
There are two main ways of reassembling a Protocol Data Unit (PDU) which