diff --git a/gerber/layers.py b/gerber/layers.py
index 69e1c0d..ba8f91e 100644
--- a/gerber/layers.py
+++ b/gerber/layers.py
@@ -41,7 +41,9 @@
          ),
     Hint(layer='internal',
          ext=['in', 'gt1', 'gt2', 'gt3', 'gt4', 'gt5', 'gt6',
-              'g1', 'g2', 'g3', 'g4', 'g5', 'g6', ],
+              'g1', 'g2', 'g3', 'g4', 'g5', 'g6', 
+              'g7', 'g8', 'g9', 'g10', 'g11', 'g12', 
+              'g13', 'g14', 'gp1', 'gp2', 'gp3', 'gp4',],
          name=['art', 'internal', 'pgp', 'pwr', 'gnd', 'ground',
                'gp1', 'gp2', 'gp3', 'gp4', 'gt5', 'gp6',
                'In1.Cu', 'In2.Cu', 'In3.Cu', 'In4.Cu',