diff --git a/Documentation/ceph-filesystem-crd.md b/Documentation/ceph-filesystem-crd.md
index 4b2b533cc05d2..a1bce0ad9228f 100644
--- a/Documentation/ceph-filesystem-crd.md
+++ b/Documentation/ceph-filesystem-crd.md
@@ -86,6 +86,8 @@ spec:
     replicated:
       size: 3
   dataPools:
+    - replicated:
+        size: 3
     - erasureCoded:
         dataChunks: 2
         codingChunks: 1
@@ -94,6 +96,8 @@ spec:
     activeStandby: true
 ```
 
+> **NOTE**: For erasure coded, we have to create replicated pool as primary pool and erasureCoded as secondry pool and we need to add a directory layout for a secondary ec data pool [cephfs file-layouts](https://docs.ceph.com/en/latest/cephfs/file-layouts/#adding-a-data-pool-to-the-file-system).
+
 (These definitions can also be found in the [`filesystem-ec.yaml`](https://github.com/rook/rook/blob/{{ branchName }}/cluster/examples/kubernetes/ceph/filesystem-ec.yaml) file.
 Also see an example in the [`storageclass-ec.yaml`](https://github.com/rook/rook/blob/{{ branchName }}/cluster/examples/kubernetes/ceph/csi/cephfs/storageclass-ec.yaml) for how to configure the volume.)