diff --git a/tetris.jam b/tetris.jam
index f59bf83..cde3891 100644
--- a/tetris.jam
+++ b/tetris.jam
@@ -1,21 +1,18 @@
 const { assert } = import("test");
 
-// the imports from ncurses that we need
-// `WINDOW *` is opaque on the C side so we
-// model it as `*u8` (we never deref it). ncurses' `bool` is traditionally
+// the imports from ncurses that we need.
+// `WINDOW *` is opaque on the C side so we model it as `*const u8` —
+// we never deref it from Jam. ncurses' `bool` is traditionally
 // `unsigned char`, not C99 _Bool, so we pass i8 with 1 = TRUE, 0 = FALSE.
 
-// TODO: I am not sure about [*] notation, for now I am following zig idea but
-// it's very likely it will change.
-
 // TODO: Need to evaluate C exports depending of jam build options (more tbd).
 
-extern fn initscr() *u8;
+extern fn initscr() *const u8;
 extern fn endwin() i32;
 extern fn cbreak() i32;
 extern fn noecho() i32;
-extern fn keypad(win: *u8, bf: i8) i32;
-extern fn nodelay(win: *u8, bf: i8) i32;
+extern fn keypad(win: *const u8, bf: i8) i32;
+extern fn nodelay(win: *const u8, bf: i8) i32;
 extern fn curs_set(visibility: i32) i32;
 extern fn start_color() i32;
 extern fn init_pair(pair: i16, fg: i16, bg: i16) i32;
@@ -23,15 +20,15 @@ extern fn getch() i32;
 extern fn refresh() i32;
 extern fn clear() i32;
 extern fn mvaddch(y: i32, x: i32, ch: u32) i32;
-extern fn mvprintw(y: i32, x: i32, format: [*]u8, ...) i32;
+extern fn mvprintw(y: i32, x: i32, format: *const[] u8, ...) i32;
 extern fn attron(attrs: i32) i32;
 extern fn attroff(attrs: i32) i32;
 extern fn napms(ms: i32) i32;
-extern fn mvaddstr(y: i32, x: i32, s: [*]u8) i32;
+extern fn mvaddstr(y: i32, x: i32, s: *const[] u8) i32;
 extern fn use_default_colors() i32;
-extern fn write(fd: i32, buf: [*]u8, count: u64) i64;
-extern fn setlocale(category: i32, locale: [*]u8) [*]u8;
-extern fn setenv(name: [*]u8, value: [*]u8, overwrite: i32) i32;
+extern fn write(fd: i32, buf: *const[] u8, count: u64) i64;
+extern fn setlocale(category: i32, locale: *const[] u8) *const[] u8;
+extern fn setenv(name: *const[] u8, value: *const[] u8, overwrite: i32) i32;
 
 // basically is `(n & 0xff) << 8` in ncurses' chtype encoding.
 fn colorPair(n: i32) i32 {
@@ -70,7 +67,7 @@ fn main() {
     var loc: []u8 = "";
     setlocale(0, loc.ptr);
 
-    var win: *u8 = initscr();
+    var win: *const u8 = initscr();
     cbreak();
     noecho();
     keypad(win, 1);
@@ -157,7 +154,7 @@ fn main() {
 }
 
 // it ideally tries to match github.com/samtay/tetris's relCells impl
-fn fillRelCells(shape: u8, out: [*]i8) {
+fn fillRelCells(shape: u8, out: *mut[] i8) {
     if (shape == 0) {
         // I: (-2,0), (-1,0), (1,0)
         out[0] = -2; out[1] = 0;