diff --git a/02-cni-cilium/README.md b/02-cni-cilium/README.md
index 3542014..ca2b982 100644
--- a/02-cni-cilium/README.md
+++ b/02-cni-cilium/README.md
@@ -1,6 +1,6 @@
 # 02 | CNI Cilium
 
-Only install one CNI.  Cilium brings network policy capabilities and uses eBPF technology to provide increased performance.
+Only install one CNI, do not install Flannel if using Cilium.  Cilium brings network policy capabilities and uses eBPF technology to provide increased performance.
 
 Reference: https://docs.cilium.io/en/stable/gettingstarted/k8s-install-default/
 
diff --git a/02-cni-flannel/README.md b/02-cni-flannel/README.md
index 3885e74..98de14c 100644
--- a/02-cni-flannel/README.md
+++ b/02-cni-flannel/README.md
@@ -1,5 +1,7 @@
 # 02 | CNI = Flannel
 
+### It is not recommended to use flannel, and instead should use 02-cni-cilium.   Do not install both flannel and cilium.
+
 [https://github.com/flannel-io/flannel](https://github.com/flannel-io/flannel)
 
 Flannel provides the pod to pod networking, using [VXLAN](https://en.wikipedia.org/wiki/Virtual_Extensible_LAN).