diff --git a/clients/client-api-gateway/src/models/models_0.ts b/clients/client-api-gateway/src/models/models_0.ts
index ab8b9d198f9e..8c465744f5fd 100644
--- a/clients/client-api-gateway/src/models/models_0.ts
+++ b/clients/client-api-gateway/src/models/models_0.ts
@@ -1244,7 +1244,7 @@ export interface DomainName {
   certificateArn?: string;
 
   /**
-   * <p>The timestamp when the certificate that was used by edge-optimized endpoint for this domain name was uploaded.</p>
+   * <p>The timestamp when the certificate that was used by edge-optimized endpoint for this domain name was uploaded. API Gateway doesn't change this value if you update the certificate.</p>
    * @public
    */
   certificateUploadDate?: Date;
diff --git a/codegen/sdk-codegen/aws-models/api-gateway.json b/codegen/sdk-codegen/aws-models/api-gateway.json
index 530eb2ca8811..bea1e0dd3c6c 100644
--- a/codegen/sdk-codegen/aws-models/api-gateway.json
+++ b/codegen/sdk-codegen/aws-models/api-gateway.json
@@ -4877,7 +4877,7 @@
         "certificateUploadDate": {
           "target": "com.amazonaws.apigateway#Timestamp",
           "traits": {
-            "smithy.api#documentation": "<p>The timestamp when the certificate that was used by edge-optimized endpoint for this domain name was uploaded.</p>"
+            "smithy.api#documentation": "<p>The timestamp when the certificate that was used by edge-optimized endpoint for this domain name was uploaded. API Gateway doesn't change this value if you update the certificate.</p>"
           }
         },
         "regionalDomainName": {