doc/rados/operations: Clarify exiting in stretch-mode.rst

Signed-off-by: Anthony D'Atri <anthonyeleven@users.noreply.github.com>

diff --git a/doc/rados/operations/stretch-mode.rst b/doc/rados/operations/stretch-mode.rst
index 18008a6994b110b0699ac02369e3fdcfb9d8d733..1ec6cc370e2726da963c5a1cfdca949df0bc4cd5 100644 (file)
--- a/doc/rados/operations/stretch-mode.rst
+++ b/doc/rados/operations/stretch-mode.rst
@@ -318,6 +318,10 @@ Note that the command will not execute when the cluster is in
 recovery stretch mode. The command executes only when the cluster
 is in degraded stretch mode or healthy stretch mode.
 
+.. important:: The ability to exit stretch mode is not present in
+               releases before 18.2.8 (Reef). Clusters running an
+               earlier release should be updated to 18.2.8 or later.
+
 Limitations of Stretch Mode 
 ===========================
 When using stretch mode, OSDs must be located at exactly two sites.