diff --git a/clients/client-pinpoint/src/models/models_0.ts b/clients/client-pinpoint/src/models/models_0.ts
index 4846eaf183aa2..9eeeeaa0c967e 100644
--- a/clients/client-pinpoint/src/models/models_0.ts
+++ b/clients/client-pinpoint/src/models/models_0.ts
@@ -6432,7 +6432,7 @@ export interface DeleteEndpointRequest {
 
   /**
    * @public
-   * <p>The unique identifier for the endpoint.</p>
+   * <p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>\{</code> or <code>\}</code>.</p>
    */
   EndpointId: string | undefined;
 }
diff --git a/clients/client-pinpoint/src/models/models_1.ts b/clients/client-pinpoint/src/models/models_1.ts
index e93c57228169f..c12286fccffe7 100644
--- a/clients/client-pinpoint/src/models/models_1.ts
+++ b/clients/client-pinpoint/src/models/models_1.ts
@@ -202,7 +202,7 @@ export interface GetEndpointRequest {
 
   /**
    * @public
-   * <p>The unique identifier for the endpoint.</p>
+   * <p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>\{</code> or <code>\}</code>.</p>
    */
   EndpointId: string | undefined;
 }
@@ -3220,7 +3220,7 @@ export interface UpdateEndpointRequest {
 
   /**
    * @public
-   * <p>The unique identifier for the endpoint.</p>
+   * <p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>\{</code> or <code>\}</code>.</p>
    */
   EndpointId: string | undefined;
 
diff --git a/codegen/sdk-codegen/aws-models/pinpoint.json b/codegen/sdk-codegen/aws-models/pinpoint.json
index 7365fa2248852..b3e4a64661374 100644
--- a/codegen/sdk-codegen/aws-models/pinpoint.json
+++ b/codegen/sdk-codegen/aws-models/pinpoint.json
@@ -4773,7 +4773,7 @@
         "EndpointId": {
           "target": "com.amazonaws.pinpoint#__string",
           "traits": {
-            "smithy.api#documentation": "<p>The unique identifier for the endpoint.</p>",
+            "smithy.api#documentation": "<p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>{</code> or <code>}</code>.</p>",
             "smithy.api#httpLabel": {},
             "smithy.api#required": {}
           }
@@ -9204,7 +9204,7 @@
         "EndpointId": {
           "target": "com.amazonaws.pinpoint#__string",
           "traits": {
-            "smithy.api#documentation": "<p>The unique identifier for the endpoint.</p>",
+            "smithy.api#documentation": "<p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>{</code> or <code>}</code>.</p>",
             "smithy.api#httpLabel": {},
             "smithy.api#required": {}
           }
@@ -19648,7 +19648,7 @@
         "EndpointId": {
           "target": "com.amazonaws.pinpoint#__string",
           "traits": {
-            "smithy.api#documentation": "<p>The unique identifier for the endpoint.</p>",
+            "smithy.api#documentation": "<p>The case insensitive unique identifier for the endpoint. The identifier can't contain <code>$</code>, <code>{</code> or <code>}</code>.</p>",
             "smithy.api#httpLabel": {},
             "smithy.api#required": {}
           }