diff --git a/src/commands/math/commands.js b/src/commands/math/commands.js
index 53fb861..4e1b823 100644
--- a/src/commands/math/commands.js
+++ b/src/commands/math/commands.js
@@ -328,6 +328,15 @@
     this.sup.downOutOf = insLeftOfMeUnlessAtEnd;
     super_.finalizeTree.call(this);
   };
+  _.reflow = function() {
+     var $block = this.ends[R].jQ;//mq-sup
+     $block = $block.parent() ;//mq-supsub
+
+     var h = $block.prev().innerHeight() ;
+     h *= 0.6 ;
+
+     $block.css( 'vertical-align',  h + 'px' ) ;
+  } ;
 });
 
 var SummationNotation = P(MathCommand, function(_, super_) {