Index: src/OFPlugin.h
==================================================================
--- src/OFPlugin.h
+++ src/OFPlugin.h
@@ -39,10 +39,14 @@
 
 /**
  * @class OFPlugin OFPlugin.h ObjFW/OFPlugin.h
  *
  * @brief Provides a system for loading plugins at runtime.
+ *
+ * A plugin must subclass @ref OFPlugin and have a global function called
+ * `OFPluginInit`, which returns an instance of the @ref OFPlugin subclass and
+ * takes no parameters.
  */
 @interface OFPlugin: OFObject
 {
 	OFPluginHandle _pluginHandle;
 	OF_RESERVE_IVARS(OFPlugin, 4)