Index: src/main/java/org/apache/jackrabbit/filevault/maven/packaging/VaultMojo.java
===================================================================
--- src/main/java/org/apache/jackrabbit/filevault/maven/packaging/VaultMojo.java	(revision 1816417)
+++ src/main/java/org/apache/jackrabbit/filevault/maven/packaging/VaultMojo.java	(working copy)
@@ -177,6 +177,12 @@
     private File filterSource;
 
     /**
+     * Optional reference to PNG image that should be used as thumbnail for the content package.
+     */
+    @Parameter
+    private File thumbnailImage;
+
+    /**
      * The directory containing the content to be packaged up into the content
      * package.
      */
@@ -528,6 +534,16 @@
                     throw new MojoExecutionException("Package should not contain index definitions, because 'allowIndexDefinitions=false'.");
                 }
             }
+            
+            // add package thumbnail
+            if (thumbnailImage != null && thumbnailImage.exists()) {
+                File vaultDefinitionFolder = new File(vaultDir, "definition");
+                if (!vaultDefinitionFolder.exists()) {
+                    vaultDefinitionFolder.mkdir();
+                }
+                copyFile("/vault/definition/.content.xml", new File(vaultDefinitionFolder, ".content.xml"));
+                FileUtils.copyFile(thumbnailImage, new File(vaultDefinitionFolder, "thumbnail.png"));
+            }
 
             MavenArchiver mavenArchiver = new MavenArchiver();
             mavenArchiver.setArchiver(contentPackageArchiver);
Index: src/main/resources/vault/definition/.content.xml
===================================================================
--- src/main/resources/vault/definition/.content.xml	(nonexistent)
+++ src/main/resources/vault/definition/.content.xml	(working copy)
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<jcr:root xmlns:vlt="http://www.day.com/jcr/vault/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0"
+  jcr:primaryType="vlt:PackageDefinition"
+/>
\ No newline at end of file

Property changes on: src/main/resources/vault/definition/.content.xml
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:keywords
## -0,0 +1 ##
+LastChangedDate LastChangedRevision LastChangedBy HeadURL Id Author
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property
Index: src/main/resources/vault/definition/.content.xml
===================================================================
--- src/main/resources/vault/definition/.content.xml	(nonexistent)
+++ src/main/resources/vault/definition/.content.xml	(working copy)
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<jcr:root xmlns:vlt="http://www.day.com/jcr/vault/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0"
+  jcr:primaryType="vlt:PackageDefinition"
+/>
\ No newline at end of file

Property changes on: src/main/resources/vault/definition/.content.xml
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:keywords
## -0,0 +1 ##
+LastChangedDate LastChangedRevision LastChangedBy HeadURL Id Author
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property