Index: index.html
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--- index.html	(revision 9675)
+++ index.html	(revision 9676)
@@ -453,7 +453,7 @@
 	<tr><td> Outline routing path      <td> Outline layer                                             <td> designed using standard pcb-rnd elemnts
 	<tr><td> Polygon pour              <td> Polygon                                                   <td> an object available for design in any layer group
 	<tr><td> Plane                     <td> Polygon                                                   <td> see above 
-	<tr><td> Mask                      <td> A layer group adjacent to the outside copper layer group  <td> design layers available: automatic, additive, subtractive
+	<tr><td> Mask (solder mask)        <td> A layer group adjacent to the outside copper layer group  <td> design layers available: automatic, additive, subtractive
 	<tr><td> Silk                      <td> A layer group adjacent to the mask layer group            <td> design layers available: automatic, additive, subtractive
 	<tr><td> N/A, or poss. net/circuit <td> Rats                                                      <td> assistive layer automatically generated with netlist and copper layer group connection data
 </table>