Simplify USAGE.md

USAGE.md

@@ -7,18 +7,7 @@ does all this for you. See README.md for more details.
 * optionally create a toml file at `<dir>/settings.toml` (see `example_settings.toml` for reference)
 * `gcc -E -P -I header_dir -D'__attribute__(x)=' orig_c_file.c > <dir>/base.c`
 * `python3 strip_other_fns.py <dir>/base.c func_name`
-* put asm for `func_name` into `<dir>/target.s`, with the following header:
-
-```asm
-.set noat
-.set noreorder
-.set gp=64
-.macro glabel label
-    .global \label
-	.type \label, @function
-    \label:
-.endm
-```
+* put asm for `func_name` into `<dir>/target.s`, together with the header from `prelude.inc`
 * `mips-linux-gnu-as -march=vr4300 -mabi=32 <dir>/target.s -o <dir>/target.o`
 * optional sanity check:
   - `<dir>/compile.sh <dir>/base.c -o <dir>/base.o`