diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1,5 +1,98 @@
 # irsa-manager
 
+irsa-manager allows you to easily set up IAM Roles for Service Accounts (IRSA) on non-EKS Kubernetes clusters.
+
+## Introduction
+
+IRSA (IAM Roles for Service Accounts) allows Kubernetes service accounts to assume AWS IAM roles.
+This is particularly useful for providing Kubernetes workloads with the necessary AWS permissions in a secure manner.
+
+## Prerequisites
+
+Before you begin, ensure you have the following:
+
+- A running Kubernetes cluster (non-EKS).
+- Helm installed on your local machine.
+- AWS user credentials with appropriate permissions.
+
+## Setup
+
+Follow these steps to set up IRSA on your non-EKS cluster:
+
+1. install helm
+
+Add the irsa-manager Helm repository and install irsa-manager:
+
+```
+helm repo add kkb0318 https://kkb0318.github.io/irsa-manager
+helm repo update
+helm install irsa-manager kkb0318/irsa-manager -n irsa-manager-system --create-namespace
+```
+
+2. Set AWS Secret for IRSA Manager
+
+Create a secret for irsa-manager to access AWS:
+
+```
+kubectl create secret generic aws-secret -n irsa-manager-system \
+  --from-literal=aws-access-key-id=<your-access-key-id> \
+  --from-literal=aws-secret-access-key=<your-secret-access-key> \
+  --from-literal=aws-region=<your-region> \
+  --from-literal=aws-role-arn=<your-role-arn>  # Optional: Set this if you want to switch roles
+
+```
+
+3. Create an IRSASetup Custom Resource
+
+Define and apply an IRSASetup custom resource according to your needs.
+
+4. Modify kube-apiserver Settings
+
+Execute the following commands on the control plane server to save the public and private keys for Kubernetes signatures:
+
+```
+kubectl get secret -n kube-system irsa-manager-key -o jsonpath="{.data.ssh-privatekey}" | base64 --decode | sudo tee /etc/kubernetes/pki/irsa-manager.key > /dev/null
+kubectl get secret -n kube-system irsa-manager-key -o jsonpath="{.data.ssh-publickey}" | base64 --decode | sudo tee /etc/kubernetes/pki/irsa-manager.pub > /dev/null
+```
+
+Then, modify the kube-apiserver.yaml file to include the following parameters:
+
+- API Audiences
+
+```
+--api-audiences=sts.amazonaws.com
+```
+
+- Service Account Issuer
+
+```
+--service-account-issuer=https://s3-<region>.amazonaws.com/<bucketName>
+```
+
+- Service Account Key File
+
+The public key (oidc-issuer.pub) generated previously can be read by the API server. Add the path for this parameter flag:
+
+```
+--service-account-key-file=/etc/kubernetes/pki/irsa-manager.pub
+```
+
+> [!NOTE]
+> Add this setting as the first element. If specified multiple times, tokens signed by any of the specified keys are considered valid by the Kubernetes API server.
+
+- Service Account Signing Key File
+
+The private key (oidc-issuer.key) generated previously can be read by the API server. Add the path for this parameter flag:
+
+```
+--service-account-signing-key-file=/etc/kubernetes/pki/irsa-manager.key
+```
+
+> [!NOTE]
+> Add these settings before the existing ones. If specified multiple times, tokens signed by any of the specified keys are considered valid by the Kubernetes API server.
+
+For more details, refer to the [Kubernetes documentation](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#serviceaccount-token-volume-projection).
+
 TODO
 
 - [x] delete secret
@@ -10,13 +103,11 @@ TODO
 - [x] delete idp
 - [x] issue: when irsasetup was deleted, resource remained with some error occured
 - [x] certificate
-- [ ] check keys.json keyid has to be empty or not
-- [ ] IRSA api
+- [x] check keys.json keyid has to be empty or not
+- [x] IRSA api
 - [ ] use with cert-manager
+- [ ] aws context
+- [ ] temporary aws account
+- [ ] cannot delete IRSASetup before existing IRSA
 
 - [ ] validation webhook (invalid to change)
-
-```
-kubectl get secret -n kube-system irsa-manager-key -o jsonpath="{.data.ssh-privatekey}" | base64 --decode | sudo tee /etc/kubernetes/pki/irsa-manager.key > /dev/null
-kubectl get secret -n kube-system irsa-manager-key -o jsonpath="{.data.ssh-publickey}" | base64 --decode | sudo tee /etc/kubernetes/pki/irsa-manager.pub > /dev/null
-```