diff --git a/packages/@aws-cdk/aws-sagemaker-alpha/lib/container-image.ts b/packages/@aws-cdk/aws-sagemaker-alpha/lib/container-image.ts
index 8a48d1bbde767..c6e4423b06b6d 100644
--- a/packages/@aws-cdk/aws-sagemaker-alpha/lib/container-image.ts
+++ b/packages/@aws-cdk/aws-sagemaker-alpha/lib/container-image.ts
@@ -26,9 +26,12 @@ export interface ContainerImageConfig {
 export abstract class ContainerImage {
   /**
    * Reference an image in an ECR repository
+   *
+   * @param repository ECR repository
+   * @param tagOrDigest Optional image tag or digest (digests must start with `sha256:`)
    */
-  public static fromEcrRepository(repository: ecr.IRepository, tag: string = 'latest'): ContainerImage {
-    return new EcrImage(repository, tag);
+  public static fromEcrRepository(repository: ecr.IRepository, tagOrDigest: string = 'latest'): ContainerImage {
+    return new EcrImage(repository, tagOrDigest);
   }
 
   /**
diff --git a/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts b/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts
index 7ba6d6bf320d7..893a8f764180e 100644
--- a/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts
+++ b/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts
@@ -18,9 +18,12 @@ export abstract class ContainerImage {
 
   /**
    * Reference an image in an ECR repository
+   *
+   * @param repository ECR repository
+   * @param tagOrDigest Optional image tag or digest (digests must start with `sha256:`)
    */
-  public static fromEcrRepository(repository: ecr.IRepository, tag: string = 'latest') {
-    return new EcrImage(repository, tag);
+  public static fromEcrRepository(repository: ecr.IRepository, tagOrDigest: string = 'latest') {
+    return new EcrImage(repository, tagOrDigest);
   }
 
   /**