diff --git a/api/src/main/java/jakarta/enterprise/concurrent/Async.java b/api/src/main/java/jakarta/enterprise/concurrent/Async.java
index c4d1ac7a..692e80b0 100644
--- a/api/src/main/java/jakarta/enterprise/concurrent/Async.java
+++ b/api/src/main/java/jakarta/enterprise/concurrent/Async.java
@@ -29,6 +29,9 @@
 
 /**
  * Annotates a CDI managed bean method to run asynchronously.
+ * The CDI managed bean must not be an EJB or JSF managed bean,
+ * and neither the method nor its class can be annotated with
+ * the MicroProfile Asynchronous annotation.
  * <p>
  * The Jakarta EE Product Provider runs the method on a {@link ManagedExecutorService}
  * and returns to the caller a {@link java.util.concurrent.CompletableFuture CompletableFuture}
diff --git a/specification/src/main/asciidoc/jakarta-concurrency.adoc b/specification/src/main/asciidoc/jakarta-concurrency.adoc
index 57d843e7..5a7e2bb0 100644
--- a/specification/src/main/asciidoc/jakarta-concurrency.adoc
+++ b/specification/src/main/asciidoc/jakarta-concurrency.adoc
@@ -2306,7 +2306,9 @@ task.
 == Asynchronous Methods
 
 The `jakarta.enterprise.concurrent.Async` annotation annotates a
-CDI managed bean method to run asynchronously.
+CDI managed bean method to run asynchronously. The CDI managed bean must
+not be an EJB or JSF managed bean, and neither the method nor its class
+can be annotated with the MicroProfile Asynchronous annotation.
 
 Each asynchronous method execution corresponds to a managed
 `java.util.concurrent.CompletableFuture` instance that is backed by a