diff --git a/api/fnAddTr.js b/api/fnAddTr.js
index 78f4eec..621e567 100644
--- a/api/fnAddTr.js
+++ b/api/fnAddTr.js
@@ -1,40 +1,45 @@
 /**
  * Take a TR element and add it to a DataTables table. Useful for maintaining
- * custom classes and other attributes.
+ * custom classes and other attributes. If mRow parameter is set, update
+ * mRow instead of adding a new row.
  *  @name fnAddTr
  *  @anchor fnAddTr
  *  @author <a href="http://sprymedia.co.uk">Allan Jardine</a>
  *
  *  @example
- *    
+ *
  */
 
-$.fn.dataTableExt.oApi.fnAddTr = function ( oSettings, nTr, bRedraw ) {
+$.fn.dataTableExt.oApi.fnAddTr = function ( oSettings, nTr, bRedraw, mRow ) {
     if ( typeof bRedraw == 'undefined' )
     {
         bRedraw = true;
     }
-     
+
     var nTds = nTr.getElementsByTagName('td');
     if ( nTds.length != oSettings.aoColumns.length )
     {
         alert( 'Warning: not adding new TR - columns and TD elements must match' );
         return;
     }
-     
+
     var aData = [];
     for ( var i=0 ; i<nTds.length ; i++ )
     {
         aData.push( nTds[i].innerHTML );
     }
-     
-    /* Add the data and then replace DataTable's generated TR with ours */
-    var iIndex = this.oApi._fnAddData( oSettings, aData );
-    nTr._DT_RowIndex = iIndex;
-    oSettings.aoData[ iIndex ].nTr = nTr;
-     
+
+    if (typeof mRow == 'undefined') {
+        /* Add the data and then replace DataTable's generated TR with ours */
+        var iIndex = this.oApi._fnAddData( oSettings, aData );
+        nTr._DT_RowIndex = iIndex;
+        oSettings.aoData[ iIndex ].nTr = nTr;
+    } else {
+        this.fnUpdate( aData, mRow );
+    }
+
     oSettings.aiDisplay = oSettings.aiDisplayMaster.slice();
-     
+
     if ( bRedraw )
     {
         this.oApi._fnReDraw( oSettings );