diff --git a/cmd/minikube/cmd/start_flags.go b/cmd/minikube/cmd/start_flags.go
index 4de84abecb56..ce3ceffd9a5f 100644
--- a/cmd/minikube/cmd/start_flags.go
+++ b/cmd/minikube/cmd/start_flags.go
@@ -403,6 +403,7 @@ func getCNIConfig(cmd *cobra.Command) string {
 	return chosenCNI
 }
 
+// getExtraOptions gets Kubernetes extra options from flags
 func getExtraOptions() config.ExtraOptionSlice {
 	extraOptionVals := config.ExtraOptionSlice{}
 	val := viper.GetString(extraOptions)
@@ -410,7 +411,7 @@ func getExtraOptions() config.ExtraOptionSlice {
 		return extraOptionVals
 	}
 	if err := extraOptionVals.Set(val); err != nil {
-		klog.Errorf("Invalid %s flag provided, flag will be ignored", extraOptions)
+		klog.Errorf("Invalid %s flag provided, flag will be ignored: %v", extraOptions, err)
 	}
 	return extraOptionVals
 }
diff --git a/site/content/en/docs/commands/start.md b/site/content/en/docs/commands/start.md
index 5db7d0bee417..16f9904b729e 100644
--- a/site/content/en/docs/commands/start.md
+++ b/site/content/en/docs/commands/start.md
@@ -45,7 +45,7 @@ minikube start [flags]
       --dry-run                           dry-run mode. Validates configuration, but does not mutate system state
       --embed-certs                       if true, will embed the certs in kubeconfig.
       --enable-default-cni                DEPRECATED: Replaced by --cni=bridge
-      --extra-config ExtraOption          A set of key=value pairs that describe configuration that may be passed to different components.
+      --extra-config string               A set of key=value pairs that describe configuration that may be passed to different components.
                                           		The key should be '.' separated, and the first part before the dot is the component to apply the configuration to.
                                           		Valid components are: kubelet, kubeadm, apiserver, controller-manager, etcd, proxy, scheduler
                                           		Valid kubeadm parameters: ignore-preflight-errors, dry-run, kubeconfig, kubeconfig-dir, node-name, cri-socket, experimental-upload-certs, certificate-key, rootfs, skip-phases, pod-network-cidr