Add helm migration guide

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

docs/deployment/helm.md

@@ -79,6 +79,60 @@ deletes the release. It also runs a post-delete hook that cleans up the nodes
 of all labels, annotations, taints and extended resources that were created by
 NFD.
 
+## Upgrading the chart
+
+To upgrade the `node-feature-discovery` deployment to a new version via Helm.
+
+### From v0.7 and older
+
+Please see the [Uninstall guide](https://kubernetes-sigs.github.io/node-feature-discovery/v0.7/get-started/deployment-and-usage.html#uninstallation).
+And then install using the documented [Installation guide](https://kubernetes-sigs.github.io/node-feature-discovery/master/deployment/helm.html).
+
+### From v0.8 - v0.11
+
+Helm deployment of NFD was introduced in v0.8.0.
+
+```bash
+export NFD_NS=node-feature-discovery
+# Uninstall the old NFD deployment
+helm uninstall node-feature-discovery --namespace $NFD_NS
+# Update Helm repository
+helm repo update
+# Install the new NFD deployment
+helm upgrade --install node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --create-namespace --set master.enable=false
+helm upgrade --install node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --create-namespace --set master.enable=true
+```
+
+### From v0.11 - v0.13
+
+During version v0.12 the CRD `NodeFeature` was introduced, but not enabled by default.
+
+```bash
+export NFD_NS=node-feature-discovery
+# Update Helm repository
+helm repo update
+# Install CRD's
+kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/node-feature-discovery/master/deployment/base/nfd-crds/nfd-api-crds.yaml
+# Install the new NFD deployment
+helm upgrade node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --set master.enable=false
+helm upgrade node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --set master.enable=true
+```
+
+### From v0.14+
+
+As of version v0.14 the Helm chart is the primary deployment method for NFD, and the CRD `NodeFeature` is enabled by default.
+
+```bash
+export NFD_NS=node-feature-discovery
+# Update Helm repository
+helm repo update
+# Install CRD's
+kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/node-feature-discovery/master/deployment/base/nfd-crds/nfd-api-crds.yaml
+# Install the new NFD deployment
+helm upgrade node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --set master.enable=false
+helm upgrade node-feature-discovery nfd/node-feature-discovery --namespace $NFD_NS --set master.enable=true
+```
+
 ## Chart parameters
 
 To tailor the deployment of the Node Feature Discovery to your needs following