1 files changed, 3 insertions, 1 deletions
diff --git a/grid.h b/grid.h
index 69108d4..c0246c1 100644
--- a/grid.h
+++ b/grid.h
@@ -109,7 +109,9 @@ typedef struct grid {
   A(GREATGREATDODECAGONAL,greatgreatdodecagonal) \
   A(COMPASSDODECAGONAL,compassdodecagonal) \
   A(PENROSE_P2,penrose_p2_kite) \
-  A(PENROSE_P3,penrose_p3_thick)
+  A(PENROSE_P3,penrose_p3_thick) \
+  A(HATS,hats) \
+  /* end of list */
 
 #define ENUM(upper,lower) GRID_ ## upper,
 typedef enum grid_type { GRIDGEN_LIST(ENUM) GRID_TYPE_MAX } grid_type;