diff --git a/modules/ve/dm/ve.dm.DocumentSynchronizer.js b/modules/ve/dm/ve.dm.DocumentSynchronizer.js
index d659996d46..30bd0a85c1 100644
--- a/modules/ve/dm/ve.dm.DocumentSynchronizer.js
+++ b/modules/ve/dm/ve.dm.DocumentSynchronizer.js
@@ -19,12 +19,12 @@ ve.dm.DocumentSynchronizer = function( model ) {
  * Adds an action to the synchronizer.
  * 
  * @method
+ * @param {String} type Type of action, can be: "insert", "delete", "rebuild", "resize" or "update"
  * @param {ve.dm.Node} node Node this action is related to
  * @param {Integer} offset Offset of node, improves performance if this has already been calculated
- * @param {String} type Type of action, can be: "insert", "delete", "rebuild", "resize" or "update"
  * @param {Integer} adjustment Node length adjustment, if any
  */
-ve.dm.DocumentSynchronizer.prototype.pushAction = function( node, offset, type, adjustment ) {
+ve.dm.DocumentSynchronizer.prototype.pushAction = function( type, node, offset, adjustment ) {
 	if ( offset === undefined ) {
 		offset = this.model.getOffsetFromNode( node );
 	}
@@ -54,10 +54,13 @@ ve.dm.DocumentSynchronizer.prototype.synchronize = function() {
 		switch ( action.type ) {
 			case 'insert':
 				// Insert the new node at the given offset
-				var target = this.model.getNodeFromOffset( offset );
+				var target = this.model.getNodeFromOffset( offset + 1 );
 				if ( target === this.model ) {
 					// Insert at the beginning of the document
-					target.splice( 0, 0, action.node );
+					this.model.splice( 0, 0, action.node );
+				} else if ( target === null ) {
+					// Insert at the end of the document
+					this.model.splice( this.model.getElementLength(), 0, action.node );
 				} else {
 					// Insert before the element currently at the offset
 					parent = target.getParent();
@@ -85,13 +88,13 @@ ve.dm.DocumentSynchronizer.prototype.synchronize = function() {
 				break;
 			case 'resize':
 				// Adjust node length - causes update events to be emitted
-				node.adjustContentLength( adjustment );
+				action.node.adjustContentLength( action.adjustment );
 				// Adjust proceeding offsets by the amount the node is being lengthened or shortened
 				adjustment += action.adjustment;
 				break;
 			case 'update':
 				// Emit update events
-				node.emit( 'update' );
+				action.node.emit( 'update' );
 				break;
 		}
 	}
diff --git a/tests/ve/index.html b/tests/ve/index.html
index b6051b528e..bdbd2490e7 100644
--- a/tests/ve/index.html
+++ b/tests/ve/index.html
@@ -33,6 +33,7 @@
 		<script src="../../modules/ve/dm/ve.dm.TransactionProcessor.js"></script>
 		<script src="../../modules/ve/dm/ve.dm.Transaction.js"></script>
 		<script src="../../modules/ve/dm/ve.dm.Surface.js"></script>
+		<script src="../../modules/ve/dm/ve.dm.DocumentSynchronizer.js"></script>
 
 		<script src="../../modules/ve/dm/nodes/ve.dm.DocumentNode.js"></script>
 		<script src="../../modules/ve/dm/nodes/ve.dm.HeadingNode.js"></script>
@@ -55,6 +56,7 @@
 		<script src="ve.Node.test.js"></script>
 		<script src="ve.BranchNode.test.js"></script>
 		<script src="ve.dm.TransactionProcessor.test.js"></script>
+		<script src="ve.dm.DocumentSynchronizer.test.js"></script>
 		<script src="ve.dm.BranchNode.test.js"></script>
 		<script src="ve.dm.DocumentNode.test.js"></script>
 	</body>
diff --git a/tests/ve/ve.dm.DocumentSynchronizer.test.js b/tests/ve/ve.dm.DocumentSynchronizer.test.js
new file mode 100644
index 0000000000..f380584173
--- /dev/null
+++ b/tests/ve/ve.dm.DocumentSynchronizer.test.js
@@ -0,0 +1,62 @@
+module( 've/dm' );
+
+test( 've.dm.TransactionSynchronizer', function() {
+	var model,
+		sync,
+		node,
+		data;
+
+	// Test 1 - node resizing
+
+	model = ve.dm.DocumentNode.newFromPlainObject( veTest.obj );
+	sync = new ve.dm.DocumentSynchronizer( model );
+	// Delete bold "b" from first paragraph
+	model.data.splice( 2, 1 );
+	// Push resize action
+	sync.pushAction( 'resize', model.getChildren()[0], 0, -1 );
+	// Sync
+	sync.synchronize();
+	equal( model.getChildren()[0].getContentLength(), 2, 'resize actions adjust node lengths' );
+
+	// Test 2 - node insertion (in the middle)
+
+	model = ve.dm.DocumentNode.newFromPlainObject( veTest.obj );
+	sync = new ve.dm.DocumentSynchronizer( model );
+	// Insert element after first paragraph
+	data = [{ 'type': 'paragraph' }, 'x', { 'type': '/paragraph' }];
+	node = ve.dm.DocumentNode.createNodesFromData( data )[0];
+	ve.insertIntoArray( model.data, 5, data );
+	// Push insertion action
+	sync.pushAction( 'insert', node, 5 );
+	// Sync
+	sync.synchronize();
+	deepEqual( model.getChildren()[1].getContentData(), ['x'], 'insert actions add new nodes' );
+
+	// Test 3 - node insertion (at the start)
+
+	model = ve.dm.DocumentNode.newFromPlainObject( veTest.obj );
+	sync = new ve.dm.DocumentSynchronizer( model );
+	// Insert element after first paragraph
+	data = [{ 'type': 'paragraph' }, 'x', { 'type': '/paragraph' }];
+	node = ve.dm.DocumentNode.createNodesFromData( data )[0];
+	ve.insertIntoArray( model.data, 0, data );
+	// Push insertion action
+	sync.pushAction( 'insert', node, 0 );
+	// Sync
+	sync.synchronize();
+	deepEqual( model.getChildren()[0].getContentData(), ['x'], 'insert actions add new nodes' );
+
+	// Test 4 - node insertion (at the end)
+	model = ve.dm.DocumentNode.newFromPlainObject( veTest.obj );
+	sync = new ve.dm.DocumentSynchronizer( model );
+	// Insert element after first paragraph
+	data = [{ 'type': 'paragraph' }, 'x', { 'type': '/paragraph' }];
+	node = ve.dm.DocumentNode.createNodesFromData( data )[0];
+	ve.insertIntoArray( model.data, 34, data );
+	// Push insertion action
+	sync.pushAction( 'insert', node, 34 );
+	// Sync
+	sync.synchronize();
+	deepEqual( model.getChildren()[3].getContentData(), ['x'], 'insert actions add new nodes' );
+} );
+