diff --git a/charts/ceph-csi-cephfs/values.yaml b/charts/ceph-csi-cephfs/values.yaml
index 8dd8c9df4ed..71beb9001bd 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 userID 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..cfd3d822828 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 userID must not include the "client." prefix!
   userID: <plaintext ID>
   userKey: <Ceph auth key corresponding to userID above>
   # Encryption passphrase
diff --git a/examples/cephfs/secret.yaml b/examples/cephfs/secret.yaml
index adf29d3f69a..dc0e57609b5 100644
--- a/examples/cephfs/secret.yaml
+++ b/examples/cephfs/secret.yaml
@@ -6,6 +6,7 @@ metadata:
   namespace: default
 stringData:
   # Required for statically and dynamically provisioned volumes
+  # The userID must not include the "client." prefix!
   userID: <plaintext ID>
   userKey: <Ceph auth key corresponding to ID above>
 
diff --git a/examples/rbd/secret.yaml b/examples/rbd/secret.yaml
index ffb99914580..d53175ab575 100644
--- a/examples/rbd/secret.yaml
+++ b/examples/rbd/secret.yaml
@@ -8,6 +8,7 @@ stringData:
   # 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 userID must not include the "client." prefix!
   userID: <plaintext ID>
   userKey: <Ceph auth key corresponding to ID above>