diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ebe3b7eb..28f8a0aa 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,9 +31,10 @@ repos:
         name: "Kubeconform Helm - min k8s version"
         files: ^charts/[^/]+/(\.kubeconform|\.helmignore|templates/NOTES.txt|.*\.(ya?ml|json|tpl))$
         args:
-          - --kubernetes-version=1.21.0
-          - --exclude-charts=alfresco-common,alfresco-sync-service
+          - --kubernetes-version=1.25.0
+          - --exclude-charts=alfresco-common
           - --values-dir=ci
+          - --strict
   - repo: https://github.com/jtyr/kubeconform-helm
     rev: v0.1.16
     hooks:
@@ -41,8 +42,9 @@ repos:
         name: "Kubeconform Helm - current k8s version"
         files: ^charts/[^/]+/(\.kubeconform|\.helmignore|templates/NOTES.txt|.*\.(ya?ml|json|tpl))$
         args:
-          - --exclude-charts=alfresco-common,alfresco-sync-service
+          - --exclude-charts=alfresco-common
           - --values-dir=ci
+          - --strict
   - repo: local
     hooks:
       - id: custom-check-chart-versions
diff --git a/docs/README.md b/docs/README.md
index 291231b0..8313fa20 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -18,6 +18,19 @@ Each individual chart has its own documentation page that's available in the
 chart directory in [charts/](../charts). There are the values available for
 each of them.
 
+## Testing
+
+Each chart is tested against a default configuration on
+[KinD](https://kind.sigs.k8s.io/). You can check the currently tested K8s version
+by looking at the `KIND_NODE_IMAGE` value in the main [lint-test
+workflow](../.github/workflows/lint-test.yaml).
+
+We are ensuring backward compatibility with older K8s versions with
+[kubeconform](https://github.com/yannh/kubeconform). You can check the oldest
+ K8s version tested by looking at `kubernetes-version` inside the
+ `kubeconform-helm-min` hook in [pre-commit
+ configuration](../.pre-commit-config.yaml).
+
 ## Development
 
 This repository follows the