README.md: imagemagick is required now

README.md

@@ -10,20 +10,20 @@ A cooking game for the 1989 Nintendo Game Boy (DMG-01). Should run on later mode
 
 ## building
 
-1. install rgbds
+1. install rgbds and imagemagick
 2. `make`, this will produce `undercooked_xyz.gb` where `xyz` is the version
 
 ## playing
 
 - you can run on real hardware with a flash cart like the GB USB 64M
-- you can run on your regular emulator of choice, zboy is fine
-- you can run on bgb, a very good emulator with a debugger, using wine
+- you can run on your regular emulator of choice, zboy is fine (change EMULATOR in the makefile, then run `make play`)
+- you can run on bgb, a very good emulator with a debugger, using wine (put a script called `bgb` on your $PATH that launches bgb with wine, then run `make play`)
 
 ## developing
 
 1. make some changes
 2. run `make optimcheck` to make sure you didn't miss any easily optimizable instructions
-3. run `make play` to test it with bgb, assuming you have a binary called `bgb` on your $PATH that launches bgb with wine
+3. run `make play` to play it with the EMULATOR configured in the Makefile
 
 ## naming conventions