use master branch instead of HEAD
diff --git a/pom.xml b/pom.xml
index 1fcc7da..cf84f8b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,7 +51,7 @@
     <connection>scm:git:https://gitbox.apache.org/repos/asf/maven-doxia-sitetools.git</connection>
     <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven-doxia-sitetools.git</developerConnection>
     <url>https://github.com/apache/maven-doxia-sitetools/tree/${project.scm.tag}</url>
-    <tag>HEAD</tag>
+    <tag>master</tag>
   </scm>
   <issueManagement>
     <system>jira</system>