diff --git a/knowledge base/cni.placeholder b/knowledge base/cni.placeholder
new file mode 100644
index 0000000..d0a2ec8
--- /dev/null
+++ b/knowledge base/cni.placeholder	
@@ -0,0 +1 @@
+https://www.cni.dev/
diff --git a/knowledge base/kubernetes/calico.placeholder b/knowledge base/kubernetes/calico.placeholder
new file mode 100644
index 0000000..c24ca2e
--- /dev/null
+++ b/knowledge base/kubernetes/calico.placeholder	
@@ -0,0 +1 @@
+https://www.tigera.io/project-calico/
diff --git a/knowledge base/kubernetes/cilium.placeholder b/knowledge base/kubernetes/cilium.placeholder
new file mode 100644
index 0000000..2c4b39f
--- /dev/null
+++ b/knowledge base/kubernetes/cilium.placeholder	
@@ -0,0 +1 @@
+https://cilium.io/