     [Inspectable(category="General", defaultValue="NaN")]
 
     /**
-     * The ending scale factor in the y direction.
+     *  The ending scale factor in the y direction.
+     *  A scale value of 0.0 is invalid.
      *
      *  @langversion 3.0
      *  @playerversion Flash 10

    [Inspectable(category="General", defaultValue="NaN")]

    /**
     * The starting scale factor in the x direction.
     *
     *  @langversion 3.0
     *  @playerversion Flash 10

    [Inspectable(category="General", defaultValue="NaN")]

    /**
     *  The factor by which to scale the object in the x direction.
     *  This is an optional parameter that can be used instead of one
     *  of the other from/to values to specify the delta to add to the
     *  from value or to derive the from value by subtracting from the
     *  to value.
     *
     *  @langversion 3.0
     *  @playerversion Flash 10
