* The 'rados create <objectname> [category]' optional category argument is no
longer supported or recognized.
+
+* There is a new version of the librados watch/notify API with vastly
+ improved semantics. Any applications using this interface are
+ encouraged to migrate to the new API. The old API calls are marked
+ as deprecated and will eventually be removed.
+
+* The librados rados_unwatch() call used to be safe to call on an
+ invalid handle. The new version has undefined behavior when passed
+ a bogus value (for example, when rados_watch() returns an error and
+ handle is not defined).