diff --git a/Makefile b/Makefile
index fd498ed..7029e53 100644
--- a/Makefile
+++ b/Makefile
@@ -35,4 +35,7 @@ solve.o: solve.h
 puzzles: sudoku.csv
 	pv sudoku.csv | tail -n+2 | cut -d, -f1 | tr -d '\n' > $@
 
+results:
+	fallocate -l 729000000 $@
+
 .PHONY: clean