diff --git a/src/Microsoft.OpenApi/Models/OpenApiOperation.cs b/src/Microsoft.OpenApi/Models/OpenApiOperation.cs
index 80aa1e429..331066b26 100644
--- a/src/Microsoft.OpenApi/Models/OpenApiOperation.cs
+++ b/src/Microsoft.OpenApi/Models/OpenApiOperation.cs
@@ -75,7 +75,7 @@ public ISet<OpenApiTagReference>? Tags
         public IOpenApiRequestBody? RequestBody { get; set; }
 
         /// <summary>
-        /// REQUIRED. The list of possible responses as they are returned from executing this operation.
+        /// The list of possible responses as they are returned from executing this operation.
         /// </summary>
         public OpenApiResponses? Responses { get; set; } = [];