Add `make extract`

1 files changed, 11 insertions, 1 deletions

diff --git a/INSTALL.md b/INSTALL.md
index 6e1dcb45..fe653525 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -19,5 +19,15 @@ python tools/setup.py
 
 ## Build the ROM
 
-To build the ROM, simply run `make` in the root directory.
+This repository does not include any of the game's assets. You will need an original decrypted ROM for the version(s) you want
+to build.
+Put the original ROM in the root directory of this repository. Please verify that your dumped ROM matches one of the versions
+below:
 
+| Version | File name         | SHA1                                       | 
+| ------- | ----------------- | ------------------------------------------ |
+| EUR     | `baserom_eur.nds` | `02be55db55cf254bd064d2b3eb368b92a5b4156d` |
+
+Run `make extract` to extract from the base ROM. You only need to do this once.
+
+Once you have extracted the base ROM, simply run `make` to rebuild it.