ammended docs

docs/network.html

@@ -2139,7 +2139,8 @@ var options: {
     <tr>
         <td>getScale()</td>
         <td>Number</td>
-        <td>Returns the scale of the network. This can be for animation.
+        <td>Returns the scale of the network. This can be for animation. This scale is like a percentage, 1.0 = 100%.
+            Zooming in is > 1.0, zooming out is < 0. Scale cannot be smaller or equal to 0.
         </td>
     </tr>
     <tr>