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..5c710df600727 100644
--- a/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts
+++ b/packages/aws-cdk-lib/aws-ecs/lib/container-image.ts
@@ -18,6 +18,8 @@ export abstract class ContainerImage {
 
   /**
    * Reference an image in an ECR repository
+   *
+   * @param tag If you don't specify this parameter, `latest` is used as default.
    */
   public static fromEcrRepository(repository: ecr.IRepository, tag: string = 'latest') {
     return new EcrImage(repository, tag);
diff --git a/packages/aws-cdk-lib/aws-sns/lib/topic.ts b/packages/aws-cdk-lib/aws-sns/lib/topic.ts
index a57569060be8d..f78b32bf8cfe3 100644
--- a/packages/aws-cdk-lib/aws-sns/lib/topic.ts
+++ b/packages/aws-cdk-lib/aws-sns/lib/topic.ts
@@ -12,6 +12,9 @@ export interface TopicProps {
   /**
    * A developer-defined string that can be used to identify this SNS topic.
    *
+   * The display name must be maximum 100 characters long, including hyphens (-),
+   * underscores (_), spaces, and tabs.
+   *
    * @default None
    */
   readonly displayName?: string;
@@ -296,6 +299,10 @@ export class Topic extends TopicBase {
       throw new Error(`signatureVersion must be "1" or "2", received: "${props.signatureVersion}"`);
     }
 
+    if (props.displayName && !Token.isUnresolved(props.displayName) && props.displayName.length > 100) {
+      throw new Error(`displayName must be less than or equal to 100 characters, got ${props.displayName.length}`);
+    }
+
     const resource = new CfnTopic(this, 'Resource', {
       archivePolicy: props.messageRetentionPeriodInDays ? {
         MessageRetentionPeriod: props.messageRetentionPeriodInDays,
diff --git a/packages/aws-cdk-lib/aws-sns/test/sns.test.ts b/packages/aws-cdk-lib/aws-sns/test/sns.test.ts
index fc1f1cd4c2846..6c8f04fb096b6 100644
--- a/packages/aws-cdk-lib/aws-sns/test/sns.test.ts
+++ b/packages/aws-cdk-lib/aws-sns/test/sns.test.ts
@@ -176,6 +176,16 @@ describe('Topic', () => {
         signatureVersion: '3',
       })).toThrow(/signatureVersion must be "1" or "2", received: "3"/);
     });
+
+    test('throw error when displayName is too long', () => {
+      const stack = new cdk.Stack();
+
+      expect(() => {
+        new sns.Topic(stack, 'MyTopic', {
+          displayName: 'a'.repeat(101),
+        });
+      }).toThrow('displayName must be less than or equal to 100 characters, got 101');
+    });
   });
 
   test('can add a policy to the topic', () => {