Add note to docs that --single cannot be extended

docs/install.md

@@ -30,6 +30,13 @@ Though the Quick Start material is written for Debian/Ubuntu, you can use it for
     sudo k0s install controller --single
     ```
 
+    NOTE:
+    The `--single` option will disable features needed for multi-node clusters, so you will not be able to extend this cluster. If you want to be able to extend the cluster in the future, you should use:
+
+    ``` shell
+    sudo k0s install controller --enable-worker --no-taints
+    ```
+
     The `k0s install controller` sub-command accepts the same flags and parameters as the `k0s controller`. Refer to [manual install](k0s-multi-node.md#install-k0s) for a custom config file example.
 
     It is possible to set environment variables with the install command:

docs/support-dump.md

@@ -35,7 +35,7 @@ To get a support bundle, after setting up the [tooling](#setting-up), you simply
 support-bundle --kubeconfig /var/lib/k0s/pki/admin.conf https://docs.k0sproject.io/stable/support-bundle-<role>.yaml
 ```
 
-Above `<role>` refers to either `controller`or `worker`. For different roles we collect different things. If you are running a controller with `--enable-worker` or `--single`, where it becomes also a worker, you can also get a comobined dump:
+Above `<role>` refers to either `controller`or `worker`. For different roles we collect different things. If you are running a controller with `--enable-worker` or `--single`, where it becomes also a worker, you can also get a combined dump:
 
 ```shell
 support-bundle --kubeconfig /var/lib/k0s/pki/admin.conf https://docs.k0sproject.io/stable/support-bundle-controller.yaml https://docs.k0sproject.io/stable/support-bundle-worker.yaml