diff --git a/fhem/FHEM/33_readingsGroup.pm b/fhem/FHEM/33_readingsGroup.pm
index 5282a1a92..ea6187a43 100644
--- a/fhem/FHEM/33_readingsGroup.pm
+++ b/fhem/FHEM/33_readingsGroup.pm
@@ -1857,8 +1857,9 @@ readingsGroup_Attr($$$;$)
         <li>headerRows<br>
         </li>
         <li>sortColumn<br>
-          -1 -> allows sorting of the table by clicking on a column header
-          &gt;= 0 -> automatically sort the table by this column after page loading
+          &gt; 0 -> automatically sort the table by this column after page loading
+          0 -> do not sort automatically but allow sorting of the table by clicking on a column header
+          &lt; 0 -> automatically sort the table in reverse by this column after page loading
         </li>
         <br><li><a href="#perlSyntaxCheck">perlSyntaxCheck</a></li>
     </ul><br>
diff --git a/fhem/www/pgm2/fhemweb_readingsGroup.js b/fhem/www/pgm2/fhemweb_readingsGroup.js
index 5681bbb75..61b0b46bf 100644
--- a/fhem/www/pgm2/fhemweb_readingsGroup.js
+++ b/fhem/www/pgm2/fhemweb_readingsGroup.js
@@ -12,13 +12,10 @@ FW_readingsGroupReadyFn() {
         setTimeout( function() {
           $(".readingsGroup").each(function() {
             var sort = parseInt($(this).attr('sortColumn'));
-            if( sort >= 0 ) {
-              var col = $(this).find('tr').eq(0).find('td').eq(sort).get(0);
-              if( sorttable && col !== undefined )
-                sorttable.innerSortFunction.apply(col, []);
-            }
+            if( sort )
+              sorttable.doSort(this, Math.abs(sort)-1, sort<0?true:false );
           } );
-        }, 10 );
+        }, 100 );
       } );
     }