diff --git a/README.md b/README.md
index 3460929..42ab31c 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Kubernetes is an open‑source platform that automates the deployment, scaling,
     - [Manifest - StringData](#manifest---stringdata)
     - [Inline with heredoc and environment variables](#inline-with-heredoc-and-environment-variables)
     - [substr](#substr)
+    - [using as env](#using-as-env)
     - [mounting](#mounting)
   - [annotations](#annotations)
   - [nodes](#nodes)
@@ -684,10 +685,24 @@ envsubst < ./secret.yaml | kubectl apply -f -
 
 ```
 
+### using as env
+
+``` yaml
+containers:
+  image: myimage
+  env:
+  - name: DB_PASSWORD
+    valueFrom:
+      secretKeyRef:
+        name: my-secret
+        key: PASSWORD
+```
+
 ### mounting
 
 ``` yaml
-
+containers:
+  - name: test
     volumeMounts:
       - name: secret-name
         mountPath: /secret