1 files changed, 2 insertions, 1 deletions
diff --git a/src/Hill.H b/src/Hill.H
index 169208b..012d152 100644
--- a/src/Hill.H
+++ b/src/Hill.H
@@ -32,7 +32,8 @@ class Hill {
   typedef enum {
     DUPLICATE   = 0x01,
     TRACK_POINT = 0x02,
-    VISIBLE     = 0x04
+    VISIBLE     = 0x04,
+    HIDDEN      = 0x08
   } flags_t;
 
   double phi, lam;