diff --git a/sdk/synapse/arm-synapse/src/models/index.ts b/sdk/synapse/arm-synapse/src/models/index.ts
index fc3f06e05b3f..7a382b69044a 100644
--- a/sdk/synapse/arm-synapse/src/models/index.ts
+++ b/sdk/synapse/arm-synapse/src/models/index.ts
@@ -1598,10 +1598,12 @@ export interface Workspace extends TrackedResource {
    */
   sqlAdministratorLoginPassword?: string;
   /**
-   * Workspace managed resource group
-   * **NOTE: This property will not be serialized. It can only be populated by the server.**
+   * Workspace managed resource group. The resource group name uniquely identifies the resource
+   * group within the user subscriptionId. The resource group name must be no longer than 90
+   * characters long, and must be alphanumeric characters (Char.IsLetterOrDigit()) and '-', '_',
+   * '(', ')' and'.'. Note that the name cannot end with '.'
    */
-  readonly managedResourceGroupName?: string;
+  managedResourceGroupName?: string;
   /**
    * Resource provisioning state
    * **NOTE: This property will not be serialized. It can only be populated by the server.**
diff --git a/sdk/synapse/arm-synapse/src/models/mappers.ts b/sdk/synapse/arm-synapse/src/models/mappers.ts
index 7bc91eecb190..fbcf535cd56f 100644
--- a/sdk/synapse/arm-synapse/src/models/mappers.ts
+++ b/sdk/synapse/arm-synapse/src/models/mappers.ts
@@ -2434,7 +2434,6 @@ export const Workspace: msRest.CompositeMapper = {
         }
       },
       managedResourceGroupName: {
-        readOnly: true,
         serializedName: "properties.managedResourceGroupName",
         type: {
           name: "String"