diff --git a/Base-Plugin-Settings.md b/Base-Plugin-Settings.md
index 9ebe975..a578ff4 100644
--- a/Base-Plugin-Settings.md
+++ b/Base-Plugin-Settings.md
@@ -98,6 +98,8 @@ The core settings defined include the following:
 
 * _check-banned-ips_ : this setting, a boolean, is used to control whether the internal web server checks the banned-ips.txt file to block access to the web client by banned IP addresses.
 
+* _persist-ids-by-ip_ : if true, player IP addresses and the associated player IDs are persistent, and will be saved on server shutdown and reloaded on server startup (allowing known IP address to player ID associations to accumulate).  Default is true (0.29 or later).
+
 * _defaultzoom_ : this setting, an integer, specifies the default zoom level for the web client when it is first loaded by a user.
 
 * _defaultworld_ : this setting, a string, specifies the name of the default world for the web client when it is first loaded by a user.