diff --git a/README.rst b/README.rst
index 8b676c3..1d41a52 100644
--- a/README.rst
+++ b/README.rst
@@ -430,6 +430,9 @@
             crush_rule: sata
             application: rbd
 
+  .. note:: For Kraken and earlier releases please specify crush_rule as a ruleset number.
+            For Kraken and earlier releases application param is not needed.
+
 Erasure ceph storage pool
 
 .. code-block:: yaml
@@ -471,6 +474,7 @@
             - region
             - rack
             - host
+            - osd
           root:
             - name: root-ssd
             - name: root-sata
@@ -553,6 +557,9 @@
             crush_rule: ssd
             application: rbd
 
+  .. note:: For Kraken and earlier releases please specify crush_rule as a ruleset number.
+            For Kraken and earlier releases application param is not needed.
+
 
 Persist CRUSH map
 --------------------