prepare release
diff --git a/site-pom.xml b/site-pom.xml
index c1adba5..bcedecf 100644
--- a/site-pom.xml
+++ b/site-pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>21-SNAPSHOT</version>
+    <version>21</version>
     <relativePath>./pom.xml</relativePath>
   </parent>
 
diff --git a/src/site-docs/apt/index.apt.vm b/src/site-docs/apt/index.apt.vm
index 2749d5b..dbabf8a 100644
--- a/src/site-docs/apt/index.apt.vm
+++ b/src/site-docs/apt/index.apt.vm
@@ -134,8 +134,8 @@
 
 #if( $project.version.endsWith( "SNAPSHOT" ) )
   master: {{{https://github.com/apache/maven-apache-parent/tree/master/pom.xml}$project.version}}
-  ({{{https://gitbox.apache.org/repos/asf?p=maven-apache-parent.git;a=blobdiff;f=pom.xml;hb=master;hpb=apache-19}diff}},
-  {{{https://github.com/apache/maven-apache-parent/compare/apache-19...master}commits}})
+  ({{{https://gitbox.apache.org/repos/asf?p=maven-apache-parent.git;a=blobdiff;f=pom.xml;hb=master;hpb=apache-21}diff}},
+  {{{https://github.com/apache/maven-apache-parent/compare/apache-21...master}commits}})
 #end
 #macro ( display $version $date )
 #**##set( $prev = $version - 1 )
@@ -147,6 +147,8 @@
 *--------------+------------+
 || <<Version>> || <<Release Date>> ||
 *--------------+------------+
+#display( 21, '2018-08-21' )
+*--------------+------------+
 #display( 20, '2018-07-07' )
 *--------------+------------+
 #display( 19, '2018-01-24' )