diff --git a/packages/aws-cdk-lib/aws-synthetics/lib/runtime.ts b/packages/aws-cdk-lib/aws-synthetics/lib/runtime.ts
index b2b5207e6235b..f56b3f2114927 100644
--- a/packages/aws-cdk-lib/aws-synthetics/lib/runtime.ts
+++ b/packages/aws-cdk-lib/aws-synthetics/lib/runtime.ts
@@ -98,6 +98,7 @@ export class Runtime {
    * - **Dependency upgrades**: The Node.js dependency is updated to 16.x.
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-4.0
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest NodeJS Puppeteer runtime.
    */
   public static readonly SYNTHETICS_NODEJS_PUPPETEER_4_0 = new Runtime('syn-nodejs-puppeteer-4.0', RuntimeFamily.NODEJS);
 
@@ -111,6 +112,7 @@ export class Runtime {
    * - **Dependency upgrade**: The Puppeteer-core version is updated to 19.7.0. The Chromium version is upgraded to 111.0.5563.146.
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-5.0
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest NodeJS Puppeteer runtime.
    */
   public static readonly SYNTHETICS_NODEJS_PUPPETEER_5_0 = new Runtime('syn-nodejs-puppeteer-5.0', RuntimeFamily.NODEJS);
 
@@ -124,6 +126,7 @@ export class Runtime {
    * - **Bug fix**: This runtime fixes a bug in `syn-nodejs-puppeteer-5.0` where the HAR files created by the canaries were missing request headers.
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-5.1
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest NodeJS Puppeteer runtime.
    */
   public static readonly SYNTHETICS_NODEJS_PUPPETEER_5_1 = new Runtime('syn-nodejs-puppeteer-5.1', RuntimeFamily.NODEJS);
 
@@ -153,6 +156,7 @@ export class Runtime {
    * - **Bug fix**: Clean up core dump generated when Chromium crashes during a canary run.
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-6.0
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest NodeJS Puppeteer runtime.
    */
   public static readonly SYNTHETICS_NODEJS_PUPPETEER_6_0 = new Runtime('syn-nodejs-puppeteer-6.0', RuntimeFamily.NODEJS);
 
@@ -168,6 +172,7 @@ export class Runtime {
    * - **Canaries without Amazon S3 permissions**: Bug fixes, such that canaries that don't have any Amazon S3 permissions can still run. These canaries with no Amazon S3 permissions won't be able to upload screenshots or other artifacts to Amazon S3. For more information about permissions for canaries, see Required roles and permissions for canaries.
    *
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Library_nodejs_puppeteer.html#CloudWatch_Synthetics_runtimeversion-nodejs-puppeteer-6.1
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest NodeJS Puppeteer runtime.
    */
   public static readonly SYNTHETICS_NODEJS_PUPPETEER_6_1 = new Runtime('syn-nodejs-puppeteer-6.1', RuntimeFamily.NODEJS);