diff --git a/API.md b/API.md
index f9926d66..8c28128d 100644
--- a/API.md
+++ b/API.md
@@ -4231,6 +4231,8 @@ Image builder for CodeBuild image with GitHub runner pre-configured.
 
 A user named `runner` is expected to exist with access to Docker-in-Docker.
 
+The image builder determines the OS and architecture of the runner.
+
 ---
 
 ##### ~~`label`~~<sup>Optional</sup> <a name="label" id="@cloudsnorkel/cdk-github-runners.CodeBuildRunnerProviderProps.property.label"></a>
@@ -4613,6 +4615,8 @@ AMI builder that creates AMIs with GitHub runner pre-configured.
 
 On Linux, a user named `runner` is expected to exist with access to Docker.
 
+The AMI builder determines the OS and architecture of the runner.
+
 ---
 
 ##### `instanceType`<sup>Optional</sup> <a name="instanceType" id="@cloudsnorkel/cdk-github-runners.Ec2RunnerProviderProps.property.instanceType"></a>
@@ -4908,6 +4912,8 @@ Provider running an image to run inside CodeBuild with GitHub runner pre-configu
 
 A user named `runner` is expected to exist.
 
+The image builder determines the OS and architecture of the runner.
+
 ---
 
 ##### ~~`label`~~<sup>Optional</sup> <a name="label" id="@cloudsnorkel/cdk-github-runners.FargateRunnerProviderProps.property.label"></a>
@@ -5417,6 +5423,8 @@ Provider running an image to run inside CodeBuild with GitHub runner pre-configu
 
 The default command (`CMD`) should be `["runner.handler"]` which points to an included `runner.js` with a function named `handler`. The function should start the GitHub runner.
 
+The image builder determines the OS and architecture of the runner.
+
 > [https://github.com/CloudSnorkel/cdk-github-runners/tree/main/src/providers/docker-images/lambda](https://github.com/CloudSnorkel/cdk-github-runners/tree/main/src/providers/docker-images/lambda)
 
 ---
diff --git a/README.md b/README.md
index 2279b597..2aec4ac1 100644
--- a/README.md
+++ b/README.md
@@ -175,7 +175,7 @@ const myProvider = new FargateRunnerProvider(this, 'fargate runner', {
   label: 'customized-windows-fargate',
   vpc: vpc,
   securityGroup: runnerSg,
-  imageBuiler: myWindowsBuilder,
+  imageBuidler: myWindowsBuilder,
 });
 
 // create the runner infrastructure
@@ -184,6 +184,23 @@ new GitHubRunners(stack, 'runners', {
 });
 ```
 
+The runner OS and architecture is determined by the image it is set to use. For example, to create a CodeBuild runner provider for ARM64 set the `architecture` property for the image builder to `Architecture.ARM64` and use the `LINUX_ARM64_DOCKERFILE_PATH` constant.
+
+```typescript
+new GitHubRunners(stack, 'runners', {
+   providers: [
+      new FargateRunnerProvider(this, 'fargate runner', {
+         labels: ['arm64', 'fargate'],
+         imageBuidler: new CodeBuildImageBuilder(this, 'image builder', {
+            architecture: Architecture.ARM64,
+            os: Os.LINUX,
+            dockerfilePath: FargateRunner.LINUX_ARM64_DOCKERFILE_PATH,
+         }),
+      }),
+   ],
+});
+```
+
 ## Architecture
 
 ![Architecture diagram](architecture.svg)
diff --git a/src/providers/codebuild.ts b/src/providers/codebuild.ts
index 0b806dbd..efa642fa 100644
--- a/src/providers/codebuild.ts
+++ b/src/providers/codebuild.ts
@@ -31,6 +31,8 @@ export interface CodeBuildRunnerProviderProps extends RunnerProviderProps {
   /**
    * Image builder for CodeBuild image with GitHub runner pre-configured. A user named `runner` is expected to exist with access to Docker-in-Docker.
    *
+   * The image builder determines the OS and architecture of the runner.
+   *
    * @default image builder with `CodeBuildRunner.LINUX_X64_DOCKERFILE_PATH` as Dockerfile
    */
   readonly imageBuilder?: IImageBuilder;
diff --git a/src/providers/ec2.ts b/src/providers/ec2.ts
index 41323861..82d07ba0 100644
--- a/src/providers/ec2.ts
+++ b/src/providers/ec2.ts
@@ -133,6 +133,8 @@ export interface Ec2RunnerProviderProps extends RunnerProviderProps {
   /**
    * AMI builder that creates AMIs with GitHub runner pre-configured. On Linux, a user named `runner` is expected to exist with access to Docker.
    *
+   * The AMI builder determines the OS and architecture of the runner.
+   *
    * @default AMI builder for Ubuntu Linux on the same subnet as configured by {@link vpc} and {@link subnetSelection}
    */
   readonly amiBuilder?: IAmiBuilder;
diff --git a/src/providers/fargate.ts b/src/providers/fargate.ts
index fc9348fa..b69969da 100644
--- a/src/providers/fargate.ts
+++ b/src/providers/fargate.ts
@@ -32,6 +32,8 @@ export interface FargateRunnerProviderProps extends RunnerProviderProps {
   /**
    * Provider running an image to run inside CodeBuild with GitHub runner pre-configured. A user named `runner` is expected to exist.
    *
+   * The image builder determines the OS and architecture of the runner.
+   *
    * @default image builder with `FargateRunner.LINUX_X64_DOCKERFILE_PATH` as Dockerfile
    */
   readonly imageBuilder?: IImageBuilder;
diff --git a/src/providers/lambda.ts b/src/providers/lambda.ts
index beaaeb97..c63efed6 100644
--- a/src/providers/lambda.ts
+++ b/src/providers/lambda.ts
@@ -34,6 +34,8 @@ export interface LambdaRunnerProviderProps extends RunnerProviderProps {
    *
    * The default command (`CMD`) should be `["runner.handler"]` which points to an included `runner.js` with a function named `handler`. The function should start the GitHub runner.
    *
+   * The image builder determines the OS and architecture of the runner.
+   *
    * @see https://github.com/CloudSnorkel/cdk-github-runners/tree/main/src/providers/docker-images/lambda
    * @default image builder with LambdaRunner.LINUX_X64_DOCKERFILE_PATH as Dockerfile
    */