diff --git a/readme b/readme
index 09f31cc..26f7cf5 100644
--- a/readme
+++ b/readme
@@ -8,3 +8,12 @@ i want people to be able to create their own pets without having to
 figure out how to recompile.
 
 run it with `SDL_LOGGING=app=debug ./slutpet` for verbose logging
+
+file layout:
+
+dat.h - data structure header
+fns.h - functions and macros header
+
+slutpet.c - sdl init and close
+img.c - loading images
+samply.c - pet Samply