diff --git a/manual/Tasks/mimemail.html b/manual/Tasks/mimemail.html
index c86d61464..5188273b4 100644
--- a/manual/Tasks/mimemail.html
+++ b/manual/Tasks/mimemail.html
@@ -34,9 +34,10 @@
 <a href="https://javaee.github.io/javamail/">JavaMail</a>
 and <a href="https://github.com/javaee/activation">Java
 Activation Framework</a> are required for this task. The Java
-Activation Framework is part of the standard class library for Java6
-to Java9 but must be provided as an external library for Java10 and
-later again.</p>
+Activation Framework is part of the standard class library for Java 6
+to Java 10 but the <code>java.activation</code> module has been
+deprecated in Java 9 and must be enabled explicitly when running on
+Java 10. Alternatively it can be provided as an external library.</p>
 <p>Multiple files can be attached using <a href="../Types/fileset.html">FileSets.</a></p>
 <h3>Parameters</h3>
 <table border="1" cellpadding="2" cellspacing="0">
diff --git a/manual/install.html b/manual/install.html
index 2d232f0a4..84121e369 100644
--- a/manual/install.html
+++ b/manual/install.html
@@ -928,7 +928,10 @@ these tasks available. Please refer to the <a href="#optionalTasks"> Installing
   </tr>
   <tr>
     <td>activation.jar<br/>
-    (included in Java 6 to Java9 no longer included in Java10 and later)</td>
+    (included in Java 6 to Java 10 but
+    the <code>java.activation</code> module is deprecated and marked
+    for removal in Java 9 and needs to be enabled explicitly on Java
+    10)</td>
     <td><a href="Tasks/mail.html">mail</a> task with MIME encoding,
     and <i>deprecated</i> <a href="Tasks/mimemail.html">mimemail</a> task</td>
     <td><a href="https://github.com/javaee/activation"