diff --git a/byte.h b/byte.h
index 45b6988..c1e84e5 100644
--- a/byte.h
+++ b/byte.h
@@ -2,6 +2,8 @@
 #ifndef BYTE_H
 #define BYTE_H
 
+/* sandboxing note: None of these functions call any syscalls */
+
 /* for size_t: */
 #include <stddef.h>