diff --git a/clients/client-cost-explorer/src/commands/GetReservationPurchaseRecommendationCommand.ts b/clients/client-cost-explorer/src/commands/GetReservationPurchaseRecommendationCommand.ts
index 56dcea702548..0b40eff85339 100644
--- a/clients/client-cost-explorer/src/commands/GetReservationPurchaseRecommendationCommand.ts
+++ b/clients/client-cost-explorer/src/commands/GetReservationPurchaseRecommendationCommand.ts
@@ -214,6 +214,13 @@ export interface GetReservationPurchaseRecommendationCommandOutput
  * //               CurrentGeneration: true || false,
  * //               SizeFlexEligible: true || false,
  * //             },
+ * //             MemoryDBInstanceDetails: { // MemoryDBInstanceDetails
+ * //               Family: "STRING_VALUE",
+ * //               NodeType: "STRING_VALUE",
+ * //               Region: "STRING_VALUE",
+ * //               CurrentGeneration: true || false,
+ * //               SizeFlexEligible: true || false,
+ * //             },
  * //           },
  * //           RecommendedNumberOfInstancesToPurchase: "STRING_VALUE",
  * //           RecommendedNormalizedUnitsToPurchase: "STRING_VALUE",
diff --git a/clients/client-cost-explorer/src/models/models_0.ts b/clients/client-cost-explorer/src/models/models_0.ts
index 30618e0fe8c0..ad38b5d5f2bb 100644
--- a/clients/client-cost-explorer/src/models/models_0.ts
+++ b/clients/client-cost-explorer/src/models/models_0.ts
@@ -2009,7 +2009,7 @@ export interface ReservationPurchaseRecommendationMetadata {
 
 /**
  * @public
- * <p>Details about the Amazon EC2 instances that Amazon Web Services recommends that you
+ * <p>Details about the Amazon EC2 reservations that Amazon Web Services recommends that you
  *             purchase.</p>
  */
 export interface EC2InstanceDetails {
@@ -2065,8 +2065,8 @@ export interface EC2InstanceDetails {
 
 /**
  * @public
- * <p>Details about the Amazon ElastiCache instances that Amazon Web Services recommends that
- *             you purchase.</p>
+ * <p>Details about the Amazon ElastiCache reservations that Amazon Web Services recommends
+ *             that you purchase.</p>
  */
 export interface ElastiCacheInstanceDetails {
   /**
@@ -2108,8 +2108,8 @@ export interface ElastiCacheInstanceDetails {
 
 /**
  * @public
- * <p>Details about the Amazon OpenSearch Service instances that Amazon Web Services recommends
- *             that you purchase.</p>
+ * <p>Details about the Amazon OpenSearch Service reservations that Amazon Web Services
+ *             recommends that you purchase.</p>
  */
 export interface ESInstanceDetails {
   /**
@@ -2145,7 +2145,44 @@ export interface ESInstanceDetails {
 
 /**
  * @public
- * <p>Details about the Amazon RDS instances that Amazon Web Services recommends that you
+ * <p>Details about the MemoryDB reservations that Amazon Web Services recommends that you
+ *             purchase.</p>
+ */
+export interface MemoryDBInstanceDetails {
+  /**
+   * @public
+   * <p>The instance family of the recommended reservation.</p>
+   */
+  Family?: string;
+
+  /**
+   * @public
+   * <p>The node type of the recommended reservation.</p>
+   */
+  NodeType?: string;
+
+  /**
+   * @public
+   * <p>The Amazon Web Services Region of the recommended reservation.</p>
+   */
+  Region?: string;
+
+  /**
+   * @public
+   * <p>Determines whether the recommendation is for a current generation instance.</p>
+   */
+  CurrentGeneration?: boolean;
+
+  /**
+   * @public
+   * <p>Determines whether the recommended reservation is size flexible.</p>
+   */
+  SizeFlexEligible?: boolean;
+}
+
+/**
+ * @public
+ * <p>Details about the Amazon RDS reservations that Amazon Web Services recommends that you
  *             purchase.</p>
  */
 export interface RDSInstanceDetails {
@@ -2207,7 +2244,7 @@ export interface RDSInstanceDetails {
 
 /**
  * @public
- * <p>Details about the Amazon Redshift instances that Amazon Web Services recommends that
+ * <p>Details about the Amazon Redshift reservations that Amazon Web Services recommends that
  *             you purchase.</p>
  */
 export interface RedshiftInstanceDetails {
@@ -2244,41 +2281,50 @@ export interface RedshiftInstanceDetails {
 
 /**
  * @public
- * <p>Details about the instances that Amazon Web Services recommends that you
+ * <p>Details about the reservations that Amazon Web Services recommends that you
  *             purchase.</p>
  */
 export interface InstanceDetails {
   /**
    * @public
-   * <p>The Amazon EC2 instances that Amazon Web Services recommends that you purchase.</p>
+   * <p>The Amazon EC2 reservations that Amazon Web Services recommends that you
+   *             purchase.</p>
    */
   EC2InstanceDetails?: EC2InstanceDetails;
 
   /**
    * @public
-   * <p>The Amazon RDS instances that Amazon Web Services recommends that you purchase.</p>
+   * <p>The Amazon RDS reservations that Amazon Web Services recommends that you
+   *             purchase.</p>
    */
   RDSInstanceDetails?: RDSInstanceDetails;
 
   /**
    * @public
-   * <p>The Amazon Redshift instances that Amazon Web Services recommends that you
+   * <p>The Amazon Redshift reservations that Amazon Web Services recommends that you
    *             purchase.</p>
    */
   RedshiftInstanceDetails?: RedshiftInstanceDetails;
 
   /**
    * @public
-   * <p>The ElastiCache instances that Amazon Web Services recommends that you purchase.</p>
+   * <p>The ElastiCache reservations that Amazon Web Services recommends that you
+   *             purchase.</p>
    */
   ElastiCacheInstanceDetails?: ElastiCacheInstanceDetails;
 
   /**
    * @public
-   * <p>The Amazon OpenSearch Service instances that Amazon Web Services recommends that you
+   * <p>The Amazon OpenSearch Service reservations that Amazon Web Services recommends that you
    *             purchase.</p>
    */
   ESInstanceDetails?: ESInstanceDetails;
+
+  /**
+   * @public
+   * <p>The MemoryDB reservations that Amazon Web Services recommends that you purchase.</p>
+   */
+  MemoryDBInstanceDetails?: MemoryDBInstanceDetails;
 }
 
 /**
@@ -2294,7 +2340,7 @@ export interface ReservationPurchaseRecommendationDetail {
 
   /**
    * @public
-   * <p>Details about the instances that Amazon Web Services recommends that you
+   * <p>Details about the reservations that Amazon Web Services recommends that you
    *             purchase.</p>
    */
   InstanceDetails?: InstanceDetails;
diff --git a/clients/client-cost-explorer/src/protocols/Aws_json1_1.ts b/clients/client-cost-explorer/src/protocols/Aws_json1_1.ts
index 0e9d6ad295e3..0f7d22ce1108 100644
--- a/clients/client-cost-explorer/src/protocols/Aws_json1_1.ts
+++ b/clients/client-cost-explorer/src/protocols/Aws_json1_1.ts
@@ -3738,6 +3738,8 @@ const de_Impact = (output: any, context: __SerdeContext): Impact => {
 
 // de_MatchOptions omitted.
 
+// de_MemoryDBInstanceDetails omitted.
+
 // de_Metrics omitted.
 
 // de_MetricsOverLookbackPeriod omitted.
diff --git a/codegen/sdk-codegen/aws-models/cost-explorer.json b/codegen/sdk-codegen/aws-models/cost-explorer.json
index adca56902741..03d757886064 100644
--- a/codegen/sdk-codegen/aws-models/cost-explorer.json
+++ b/codegen/sdk-codegen/aws-models/cost-explorer.json
@@ -2987,7 +2987,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the Amazon EC2 instances that Amazon Web Services recommends that you\n            purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the Amazon EC2 reservations that Amazon Web Services recommends that you\n            purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#EC2ResourceDetails": {
@@ -3147,7 +3147,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the Amazon OpenSearch Service instances that Amazon Web Services recommends\n            that you purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the Amazon OpenSearch Service reservations that Amazon Web Services\n            recommends that you purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#ElastiCacheInstanceDetails": {
@@ -3193,7 +3193,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the Amazon ElastiCache instances that Amazon Web Services recommends that\n            you purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the Amazon ElastiCache reservations that Amazon Web Services recommends\n            that you purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#Entity": {
@@ -5485,36 +5485,42 @@
         "EC2InstanceDetails": {
           "target": "com.amazonaws.costexplorer#EC2InstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>The Amazon EC2 instances that Amazon Web Services recommends that you purchase.</p>"
+            "smithy.api#documentation": "<p>The Amazon EC2 reservations that Amazon Web Services recommends that you\n            purchase.</p>"
           }
         },
         "RDSInstanceDetails": {
           "target": "com.amazonaws.costexplorer#RDSInstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>The Amazon RDS instances that Amazon Web Services recommends that you purchase.</p>"
+            "smithy.api#documentation": "<p>The Amazon RDS reservations that Amazon Web Services recommends that you\n            purchase.</p>"
           }
         },
         "RedshiftInstanceDetails": {
           "target": "com.amazonaws.costexplorer#RedshiftInstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>The Amazon Redshift instances that Amazon Web Services recommends that you\n            purchase.</p>"
+            "smithy.api#documentation": "<p>The Amazon Redshift reservations that Amazon Web Services recommends that you\n            purchase.</p>"
           }
         },
         "ElastiCacheInstanceDetails": {
           "target": "com.amazonaws.costexplorer#ElastiCacheInstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>The ElastiCache instances that Amazon Web Services recommends that you purchase.</p>"
+            "smithy.api#documentation": "<p>The ElastiCache reservations that Amazon Web Services recommends that you\n            purchase.</p>"
           }
         },
         "ESInstanceDetails": {
           "target": "com.amazonaws.costexplorer#ESInstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>The Amazon OpenSearch Service instances that Amazon Web Services recommends that you\n            purchase.</p>"
+            "smithy.api#documentation": "<p>The Amazon OpenSearch Service reservations that Amazon Web Services recommends that you\n            purchase.</p>"
+          }
+        },
+        "MemoryDBInstanceDetails": {
+          "target": "com.amazonaws.costexplorer#MemoryDBInstanceDetails",
+          "traits": {
+            "smithy.api#documentation": "<p>The MemoryDB reservations that Amazon Web Services recommends that you purchase.</p>"
           }
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the instances that Amazon Web Services recommends that you\n            purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the reservations that Amazon Web Services recommends that you\n            purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#InvalidNextTokenException": {
@@ -5916,6 +5922,46 @@
         }
       }
     },
+    "com.amazonaws.costexplorer#MemoryDBInstanceDetails": {
+      "type": "structure",
+      "members": {
+        "Family": {
+          "target": "com.amazonaws.costexplorer#GenericString",
+          "traits": {
+            "smithy.api#documentation": "<p>The instance family of the recommended reservation.</p>"
+          }
+        },
+        "NodeType": {
+          "target": "com.amazonaws.costexplorer#GenericString",
+          "traits": {
+            "smithy.api#documentation": "<p>The node type of the recommended reservation.</p>"
+          }
+        },
+        "Region": {
+          "target": "com.amazonaws.costexplorer#GenericString",
+          "traits": {
+            "smithy.api#documentation": "<p>The Amazon Web Services Region of the recommended reservation.</p>"
+          }
+        },
+        "CurrentGeneration": {
+          "target": "com.amazonaws.costexplorer#GenericBoolean",
+          "traits": {
+            "smithy.api#default": false,
+            "smithy.api#documentation": "<p>Determines whether the recommendation is for a current generation instance.</p>"
+          }
+        },
+        "SizeFlexEligible": {
+          "target": "com.amazonaws.costexplorer#GenericBoolean",
+          "traits": {
+            "smithy.api#default": false,
+            "smithy.api#documentation": "<p>Determines whether the recommended reservation is size flexible.</p>"
+          }
+        }
+      },
+      "traits": {
+        "smithy.api#documentation": "<p>Details about the MemoryDB reservations that Amazon Web Services recommends that you\n            purchase.</p>"
+      }
+    },
     "com.amazonaws.costexplorer#Metric": {
       "type": "enum",
       "members": {
@@ -6126,7 +6172,7 @@
       "type": "double",
       "traits": {
         "smithy.api#range": {
-          "min": 0
+          "min": 0.0
         }
       }
     },
@@ -6415,7 +6461,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the Amazon RDS instances that Amazon Web Services recommends that you\n            purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the Amazon RDS reservations that Amazon Web Services recommends that you\n            purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#RICostForUnusedHours": {
@@ -6715,7 +6761,7 @@
         }
       },
       "traits": {
-        "smithy.api#documentation": "<p>Details about the Amazon Redshift instances that Amazon Web Services recommends that\n            you purchase.</p>"
+        "smithy.api#documentation": "<p>Details about the Amazon Redshift reservations that Amazon Web Services recommends that\n            you purchase.</p>"
       }
     },
     "com.amazonaws.costexplorer#RequestChangedException": {
@@ -6934,7 +6980,7 @@
         "InstanceDetails": {
           "target": "com.amazonaws.costexplorer#InstanceDetails",
           "traits": {
-            "smithy.api#documentation": "<p>Details about the instances that Amazon Web Services recommends that you\n            purchase.</p>"
+            "smithy.api#documentation": "<p>Details about the reservations that Amazon Web Services recommends that you\n            purchase.</p>"
           }
         },
         "RecommendedNumberOfInstancesToPurchase": {