add Reproducible Builds badge
diff --git a/README.md b/README.md
index b206ebe..cba9413 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@
[][jira]
[][license]
[](https://search.maven.org/artifact/org.apache.maven.plugins/maven-jarsigner-plugin)
+[](https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/maven/plugins/maven-jarsigner-plugin/README.md)
[][build]
[][test-results]