--- AnyEvent/README	2006/11/01 01:22:19	1.6
+++ AnyEvent/README	2006/11/24 14:50:12	1.7
@@ -147,6 +147,22 @@
 
            $result_ready->wait;
 
+GLOBALS
+    $AnyEvent::MODEL
+        Contains "undef" until the first watcher is being created. Then it
+        contains the event model that is being used, which is the name of
+        the Perl class implementing the model. This class is usually one of
+        the "AnyEvent::Impl:xxx" modules, but can be any other class in the
+        case AnyEvent has been extended at runtime (e.g. in *rxvt-unicode*).
+
+        The known classes so far are:
+
+           AnyEvent::Impl::Coro      based on Coro::Event, best choise.
+           AnyEvent::Impl::Event     based on Event, also best choice :)
+           AnyEvent::Impl::Glib      based on Glib, second-best choice.
+           AnyEvent::Impl::Tk        based on Tk, very bad choice.
+           AnyEvent::Impl::Perl      pure-perl implementation, inefficient.
+
 WHAT TO DO IN A MODULE
     As a module author, you should "use AnyEvent" and call AnyEvent methods
     freely, but you should not load a specific event module or rely on it.