diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 353aef4..7b6e2bb 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -44,6 +44,8 @@ The <action> type attribute can be add,update,fix,remove.
   </properties>
   <body>
     <release version="1.3.1" date="202Y-MM-DD" description="This is a feature and maintenance release. Java 8 or later is required.">
+      <!-- ADD -->
+      <action type="add" dev="ggregory" due-to="Gary Gregory">Add Maven property project.build.outputTimestamp for build reproducibility.</action>
       <!-- FIX -->
       <action dev="ggregory" type="fix" due-to="Elliotte Rusty Harold">Remove references to very old JDK and Commons Logging versions #201.</action>
       <!-- UPDATE -->
