diff --git a/src/libraries/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/AsyncValidationAttribute.cs b/src/libraries/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/AsyncValidationAttribute.cs
index 2de0d14ffc2219..e5d3c0b106aaed 100644
--- a/src/libraries/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/AsyncValidationAttribute.cs
+++ b/src/libraries/System.ComponentModel.Annotations/src/System/ComponentModel/DataAnnotations/AsyncValidationAttribute.cs
@@ -8,6 +8,7 @@ namespace System.ComponentModel.DataAnnotations
 {
     /// <summary>
     ///     Base class for validation attributes that require asynchronous operations, such as database lookups or API calls.
+    ///     Derived implementations must be thread-safe, as instances of this attribute may be invoked concurrently from multiple threads.
     /// </summary>
     public abstract class AsyncValidationAttribute : ValidationAttribute
     {