diff --git a/content/en/docs/concepts/architecture/nodes.md b/content/en/docs/concepts/architecture/nodes.md
index a57d47219e..50544eebb9 100644
--- a/content/en/docs/concepts/architecture/nodes.md
+++ b/content/en/docs/concepts/architecture/nodes.md
@@ -451,6 +451,11 @@ the kubelet, and the `--fail-swap-on` command line flag or `failSwapOn`
 [configuration setting](/docs/reference/config-api/kubelet-config.v1beta1/#kubelet-config-k8s-io-v1beta1-KubeletConfiguration)
 must be set to false.
 
+{{< warning >}}
+When the memory swap feature is turned on, Kubernetes data such as the content
+of Secret objects that were written to tmpfs now could be swapped to disk.
+{{< /warning >}}
+
 A user can also optionally configure `memorySwap.swapBehavior` in order to
 specify how a node will use swap memory. For example,