Add comment Makefile, change kustomize ver 5.2.0

Makefile

@@ -25,9 +25,13 @@ CRD_TO_MARKDOWN ?= $(LOCALBIN)/crd-to-markdown
 
 ## Tool Versions
 CONTROLLER_TOOLS_VERSION ?= v0.12.1
-# ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
+
+# ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary. 
+# the kubebuilder version of the ready-to-use can get by ./bin/setup-envtest list command.
 ENVTEST_K8S_VERSION = 1.27.1
-KUSTOMIZE_VERSION ?= v5.0.3
+
+# KUSTOMIZE_VERSION can be found at https://github.com/kubernetes-sigs/kustomize/releases
+KUSTOMIZE_VERSION ?= v5.2.0
 
 # Setting SHELL to bash allows bash commands to be executed by recipes.
 # This is a requirement for 'setup-envtest.sh' in the test target.