diff --git a/tapestry-core/src/main/java/org/apache/tapestry5/annotations/InjectComponent.java b/tapestry-core/src/main/java/org/apache/tapestry5/annotations/InjectComponent.java
index cc69d9d..07679b7 100644
--- a/tapestry-core/src/main/java/org/apache/tapestry5/annotations/InjectComponent.java
+++ b/tapestry-core/src/main/java/org/apache/tapestry5/annotations/InjectComponent.java
@@ -1,4 +1,4 @@
-// Copyright 2008, 2009 The Apache Software Foundation
+// Copyright 2008, 2009, 2022 The Apache Software Foundation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -39,6 +39,7 @@
 
     /**
      * If true, allows the component to be missing without throwing an exception.
+     * @since 5.8.2
      */
     boolean optional() default false;
 }