Index: Doxyfile
==================================================================
--- Doxyfile
+++ Doxyfile
@@ -5,10 +5,11 @@
 HTML_OUTPUT = .
 GENERATE_LATEX = NO
 HIDE_UNDOC_CLASSES = YES
 HIDE_UNDOC_MEMBERS = YES
 PREDEFINED = OF_HAVE_PROPERTIES		\
+	     OF_HAVE_OPTIONAL_PROTOCOLS	\
 	     OF_HAVE_BLOCKS		\
 	     OF_HAVE_THREADS		\
 	     OF_SENTINEL		\
 	     OF_RETURNS_RETAINED	\
 	     OF_RETURNS_NOT_RETAINED	\

Index: src/OFApplication.h
==================================================================
--- src/OFApplication.h
+++ src/OFApplication.h
@@ -95,11 +95,17 @@
 - (void)applicationDidReceiveSIGUSR2;
 #endif
 @end
 
 /*!
- * @brief Represents the application as an object.
+ * @brief A class which represents the application as an object.
+ *
+ * In order to create a new OFApplication, you should create a class conforming
+ * to the optional @ref OFApplicationDelegate protocol and put
+ * `OF_APPLICATION_DELEGATE(NameOfYourClass)` in the .m file of that class. The
+ * only required method of the @ref OFApplicationDelegate protocol is
+ * @ref OFApplicationDelegate::applicationDidFinishLaunching.
  */
 @interface OFApplication: OFObject
 {
 	OFString *_programName;
 	OFArray *_arguments;