diff --git a/README.md b/README.md
index e76073f..3f95d4e 100644
--- a/README.md
+++ b/README.md
@@ -6,12 +6,12 @@ Cert-manager ACME DNS webhook provider for Selectel.
 
 ## Installing
 
-To install with helm, run:
+To install with helm in namespace: cert-manager, run:
 
 ```bash
 $ helm repo add selectel https://selectel.github.io/cert-manager-webhook-selectel
 $ helm repo update
-$ helm install --name cert-manager-webhook-selectel selectel/cert-manager-webhook-selectel
+$ helm install cert-manager-webhook-selectel selectel/cert-manager-webhook-selectel -n cert-manager
 ```
 
 OR
@@ -19,15 +19,15 @@ OR
 ```bash
 $ git clone https://github.com/selectel/cert-manager-webhook-selectel.git
 $ cd cert-manager-webhook-selectel/deploy/cert-manager-webhook-selectel
-$ helm install --name cert-manager-webhook-selectel .
+$ helm install cert-manager-webhook-selectel . -n cert-manager
 ```
 
-Without helm, run:
+<!-- Without helm, run: -->
 
-```bash
+<!-- ```bash
 $ make rendered-manifest.yaml
 $ kubectl apply -f _out/rendered-manifest.yaml
-```
+``` -->
 
 ### Issuer/ClusterIssuer
 
@@ -38,6 +38,7 @@ apiVersion: v1
 kind: Secret
 metadata:
   name: selectel-api-key
+  namespace: cert-manager
 type: Opaque
 stringData:
   token: APITOKEN_FROM_MY_SELECTEL_RU
@@ -46,7 +47,7 @@ apiVersion: cert-manager.io/v1
 kind: Issuer
 metadata:
   name: letsencrypt-staging
-  namespace: default
+  namespace: cert-manager
 spec:
   acme:
     server: https://acme-staging-v02.api.letsencrypt.org/directory
@@ -78,7 +79,7 @@ apiVersion: cert-manager.io/v1
 kind: Certificate
 metadata:
   name: sel-letsencrypt-crt
-  namespace: default
+  namespace: cert-manager
 spec:
   secretName: example-com-tls
   commonName: example.com
@@ -96,8 +97,11 @@ spec:
 
 You can run the test suite with:
 
-1. Go to `https://my.selectel.ru/profile/apikeys`, get one or create new api token
-2. Fill in the appropriate values in `testdata/selectel/apikey.yml` and `testdata/selectel/config.json`
+1. Go to `https://my.selectel.ru/profile/apikeys`, get one or create new api token.
+2. Fill in the appropriate values in `testdata/selectel/apikey.yml` and `testdata/selectel/config.json`.
+    - Insert token `testdata/selectel/apikey.yml`.
+    - Check that `metadata.name` in `testdata/selectel/apikey.yml` equals value in `testdata/selectel/config.json` for key `apiKeySecretRef.name`.
+    - Check that key name in `testdata/selectel/apikey.yml` equals value in `testdata/selectel/config.json` for key `apiKeySecretRef.key`.
 
 ```bash
 $ TEST_ZONE_NAME=example.com. make test