diff --git a/src/column.h b/src/column.h
index 8b13789..f8695e4 100644
--- a/src/column.h
+++ b/src/column.h
@@ -1 +1,14 @@
+#ifndef COLUMN_H
+#define COLUMN_H
 
+extern int tile_current[3];
+extern int tile_next[3];
+int new_column ();		// select random column to drop brick into
+int disp_column (int row, int col);	// update column board
+int new_brick (void);		// choose current/preview random brick
+int rotate_col (void);
+int display_tile ();		// display current column in play (not implemented)
+int move_horiz (void);
+int move_down (void);
+
+#endif