Index: doc/developer/plugin_naming.html
===================================================================
--- doc/developer/plugin_naming.html	(revision 15428)
+++ doc/developer/plugin_naming.html	(revision 15429)
@@ -6,6 +6,7 @@
 		<li> native formats are prefixed with io_; even if your plugin can now only load or save, if it's possible to do a load-save-load round-trip without data loss, it's an io_
 		<li> interactive, often GUI, frontends are prefixed with hid_
 		<li> footprint access plugins start with fp_
+		<li> lib_ plugins are libraries used by other plugins; they are disabled by default and are enabled through the plugin dependency system
 		<li> anything else is considered a feature plugin and has no specific prefix.
 	</ul>
 </body>