diff --git a/src/fs.ads b/src/fs.ads
new file mode 100644
index 0000000..3ea5a69
--- /dev/null
+++ b/src/fs.ads
@@ -0,0 +1,5 @@
+package FS is
+
+   type Buffer is array (Natural range <>) of Unsigned_8;
+
+end FS;