diff --git a/charts/ceph-csi-cephfs/values.yaml b/charts/ceph-csi-cephfs/values.yaml
index 8dd8c9df4ed..c4b4f1398a0 100644
--- a/charts/ceph-csi-cephfs/values.yaml
+++ b/charts/ceph-csi-cephfs/values.yaml
@@ -383,6 +383,7 @@ secret:
   # Key values correspond to a user name and its key, as defined in the
   # ceph cluster. User ID should have required access to the 'pool'
   # specified in the storage class
+  # The userKey must not include the "client." prefix!
   userID: <plaintext ID>
   userKey: <Ceph auth key corresponding to the userID above>
 
diff --git a/charts/ceph-csi-rbd/values.yaml b/charts/ceph-csi-rbd/values.yaml
index 345d011b853..eb373ed7ea1 100644
--- a/charts/ceph-csi-rbd/values.yaml
+++ b/charts/ceph-csi-rbd/values.yaml
@@ -538,6 +538,7 @@ secret:
   # Key values correspond to a user name and its key, as defined in the
   # ceph cluster. User ID should have required access to the 'pool'
   # specified in the storage class
+  # The userKey must not include the "client." prefix!
   userID: <plaintext ID>
   userKey: <Ceph auth key corresponding to userID above>
   # Encryption passphrase