diff --git a/commons-jcs3-core/pom.xml b/commons-jcs3-core/pom.xml
index ea6ab9820..3e5739412 100644
--- a/commons-jcs3-core/pom.xml
+++ b/commons-jcs3-core/pom.xml
@@ -51,6 +51,7 @@
          org.apache.http.*;resolution:=optional,
          org.apache.logging.log4j.*;resolution:=optional
      </commons.osgi.import>
+     <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
      <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
diff --git a/commons-jcs3-dist/pom.xml b/commons-jcs3-dist/pom.xml
index a0e366ba9..3ac71f0f9 100644
--- a/commons-jcs3-dist/pom.xml
+++ b/commons-jcs3-dist/pom.xml
@@ -70,6 +70,7 @@
   </build>
 
   <properties>
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
diff --git a/commons-jcs3-jcache-extras/pom.xml b/commons-jcs3-jcache-extras/pom.xml
index 9dd3612fa..fdca99db5 100644
--- a/commons-jcs3-jcache-extras/pom.xml
+++ b/commons-jcs3-jcache-extras/pom.xml
@@ -95,6 +95,7 @@
 
   <properties>
     <commons.module.name>org.apache.commons.jcs3.jcache.extras</commons.module.name>
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
     <tomcat.version>9.0.98</tomcat.version>
   </properties>
diff --git a/commons-jcs3-jcache-openjpa/pom.xml b/commons-jcs3-jcache-openjpa/pom.xml
index 7c4c25655..e9e3acae4 100644
--- a/commons-jcs3-jcache-openjpa/pom.xml
+++ b/commons-jcs3-jcache-openjpa/pom.xml
@@ -82,6 +82,7 @@
 
   <properties>
     <commons.module.name>org.apache.commons.jcs3.jcache.openjpa</commons.module.name>
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 </project>
diff --git a/commons-jcs3-jcache-tck/pom.xml b/commons-jcs3-jcache-tck/pom.xml
index b3b93955c..1e3db4b96 100644
--- a/commons-jcs3-jcache-tck/pom.xml
+++ b/commons-jcs3-jcache-tck/pom.xml
@@ -58,7 +58,7 @@
 
     <domain-lib-dir>${project.build.directory}/domainlib</domain-lib-dir>
     <domain-jar>domain.jar</domain-jar>
-
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
diff --git a/commons-jcs3-jcache/pom.xml b/commons-jcs3-jcache/pom.xml
index c98996fd6..6fa0be57a 100644
--- a/commons-jcs3-jcache/pom.xml
+++ b/commons-jcs3-jcache/pom.xml
@@ -115,6 +115,7 @@
 
   <properties>
     <commons.module.name>org.apache.commons.jcs3.jcache</commons.module.name>
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 </project>
diff --git a/pom.xml b/pom.xml
index c5310df37..8cb3d5891 100644
--- a/pom.xml
+++ b/pom.xml
@@ -561,7 +561,7 @@
     <test.type>Unit</test.type>
     <doclint>none</doclint>
     <hamcrest.version>3.0</hamcrest.version>
-
+    <!-- project.build.outputTimestamp is managed by Maven plugins, see https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
     <project.build.outputTimestamp>2022-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>