Index: comm_lyt.lht
===================================================================
--- comm_lyt.lht	(revision 16821)
+++ comm_lyt.lht	(revision 16822)
@@ -27,11 +27,12 @@
 #			ha:virtual       { valtype=flag; desc={(if set, the layer is not a physical layer but a drawing or documentation)}}
 		}
 	}
+
 	ha:combining {
 		hide=1
-		type={TODO:build_data_layer_comb}
 		li:children {
 			ha:sub    { valtype=flag; desc={draw in negative}}
+			ha:auto   { valtype=flag; desc={padstacks draw their paste, mask and silk objects on the first layer (of matching type) that features the auto flag}}
 		}
 	}
 
Index: tree.html
===================================================================
--- tree.html	(revision 16821)
+++ tree.html	(revision 16822)
@@ -143,6 +143,7 @@
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;substrate <td> flag <td> &nbsp; <td> material: substrate or insulator
 <tr><td> &nbsp;&nbsp;&nbsp;combining <td> &nbsp; <td> >=2 <td> layer combination (compositing) flags
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;sub <td> flag <td> &nbsp; <td> draw in negative
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;auto <td> flag <td> &nbsp; <td> padstacks draw their paste, mask and silk objects on the first layer (of matching type) that features the auto flag
 <tr><td> &nbsp;&nbsp;&nbsp;ha:attributes <td> &nbsp; <td> &nbsp; <td>  a hash of attribute key=value pairs 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
 <tr><td> &nbsp;&nbsp;&nbsp;li:objects <td> &nbsp; <td> &nbsp; <td> list of drawing primitives put on this layer
@@ -228,6 +229,7 @@
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;substrate <td> flag <td> &nbsp; <td> material: substrate or insulator
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;combining <td> &nbsp; <td> &nbsp; <td> layer compositing match
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sub <td> flag <td> &nbsp; <td> draw in negative
+<tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;auto <td> flag <td> &nbsp; <td> padstacks draw their paste, mask and silk objects on the first layer (of matching type) that features the auto flag
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clearance <td> coord <td> &nbsp; <td> local, per-layer-type clearance; applied if global padstack clearance is 0 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;li:ps_poly <td> &nbsp; <td> &nbsp; <td> arbitrary convex polygon shape; contains a list of x;y coordinates 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ha:ps_line <td> &nbsp; <td> &nbsp; <td> straight line shape, round or square cap
Index: tree.txt
===================================================================
--- tree.txt	(revision 16821)
+++ tree.txt	(revision 16822)
@@ -140,6 +140,7 @@
     substrate           flag         material: substrate or insulator
    combining                     >=2 layer combination (compositing) flags
     sub                 flag         draw in negative
+    auto                flag         padstacks draw their paste, mask and silk objects on the first layer (of matching type) that features the auto flag
    ha:attributes                     a hash of attribute key=value pairs
     attrib-key          string       attribute value
    li:objects                        list of drawing primitives put on this layer
@@ -226,6 +227,7 @@
       substrate         flag         material: substrate or insulator
      combining                       layer compositing match
       sub               flag         draw in negative
+      auto              flag         padstacks draw their paste, mask and silk objects on the first layer (of matching type) that features the auto flag
      clearance          coord        local, per-layer-type clearance; applied if global padstack clearance is 0
      li:ps_poly                      arbitrary convex polygon shape; contains a list of x;y coordinates
      ha:ps_line                      straight line shape, round or square cap