--- libev/ev.pod	2008/04/06 09:53:18	1.142
+++ libev/ev.pod	2008/04/06 14:34:52	1.143
@@ -2635,6 +2635,16 @@
 Similar to the other two macros, this gives you the value of the default
 loop, if multiple loops are supported ("ev loop default").
 
+=item C<EV_DEFAULT_UC>, C<EV_DEFAULT_UC_>
+
+Usage identical to C<EV_DEFAULT> and C<EV_DEFAULT_>, but requires that the
+default loop has been initialised (C<UC> == unchecked). Their behaviour
+is undefined when the default loop has not been initialised by a previous
+execution of C<EV_DEFAULT>, C<EV_DEFAULT_> or C<ev_default_init (...)>.
+
+It is often prudent to use C<EV_DEFAULT> when initialising the first
+watcher in a function but use C<EV_DEFAULT_UC> afterwards.
+
 =back
 
 Example: Declare and initialise a check watcher, utilising the above