+** Upgrading from previous (stable) version if you have used No Gnus.
+
+If you have tried No Gnus (the unstable Gnus branch leading to this
+release) but went back to a stable version, be careful when upgrading
+to this version. In particular, you will probably want to remove the
+`~/News/marks' directory (perhaps selectively), so that flags are
+read from your `~/.newsrc.eld' instead of from the stale marks file,
+where this release will store flags for nntp. See a later entry for
+more information about nntp marks. Note that downgrading isn't safe
+in general.
+