1 files changed, 11 insertions, 2 deletions
diff --git a/cell.h b/cell.h
index 76ecd90..fc5f467 100644
--- a/cell.h
+++ b/cell.h
@@ -1,7 +1,16 @@
+#ifndef SUDOKU_CELL_H
+#define SUDOKU_CELL_H
+
+/* Description of a single cell on a sudoku board */
 struct cell
 {
+	/* Sovled value of this cell */
 	char val;
-	char not[9];
-} cell;
 
+	/* Array used to determine which values this cell can NOT be.
+	 * A non-zero value at index N indicates that this cell cannot have the
+	 * value N + 1 */
+	char not[9];
+};
 
+#endif /* SUDOKU_CELL_H */