doc/release-notes: amend 0.61.5 release notes

Upgrade all mons at once.  See #5673

Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/doc/release-notes.rst b/doc/release-notes.rst
index 1a8d27cbfeacb5d7d7b40296289a5571180463a4..458a9dd619ba87bf0084d11ba354743ea0dbd4ed 100644 (file)
--- a/doc/release-notes.rst
+++ b/doc/release-notes.rst
@@ -205,7 +205,11 @@ that all v0.61.x users upgrade.
 Upgrading
 ~~~~~~~~~
 
-* No issues
+* This release fixes a 32-bit vs 64-bit arithmetic bug with the
+  feature bits.  An unfortunate consequence of the fix is that 0.61.4
+  (or earlier) ceph-mon daemons can't form a quorum with 0.61.5 (or
+  later) monitors.  To avoid the possibility of service disruption, we
+  recommend you upgrade all monitors at once.
 
 Notable Changes
 ~~~~~~~~~~~~~~~