diff --git a/types.h b/types.h
index f5b3688..df3c0a4 100644
--- a/types.h
+++ b/types.h
@@ -5,7 +5,7 @@
 #include <limits.h>
 #include "config.h"
 
-// Only use big ints on architectures where it doesn't impact speed
+// Use fastest available ints unless it's 64 bits because that uses more memory
 #if INT_FAST16_MAX == INT_FAST64_MAX
 typedef  int      rowsint_t;
 typedef unsigned  columnsint_t;