diff --git a/docs/format.md b/docs/format.md
index c38ab98..5aadc32 100644
--- a/docs/format.md
+++ b/docs/format.md
@@ -2,7 +2,7 @@
 
 The MAME ROM format is not conducive to FPGA use, so we have to package up all of the assets into a new format. This format is designed with space for growth, but it should cover most usecases (i.e. games) already.
 
-First is a config section of `0x80` bytes, followed by two byte interleaved 720x720 images, `0x2DB40` bytes of mask config, and finally the ROM data.
+First is a config section of `0x100` bytes, followed by two byte interleaved 720x720 images, `0x2DB40` bytes of mask config, and finally the ROM data.
 
 ## Config
 
@@ -13,9 +13,9 @@ First bit is version. Spec V1 is as follows:
 0x8: input mapping 40 bytes - [s0 config 4 bytes][s1 config 4 bytes] ... [s7 config 4 bytes][b config 1 byte][ba config 1 byte][acl config 1 byte][grounded port index 1 byte][reserved 4 bytes]
 0x30: Start of reserved space - This is reserved for future functionality
 0x79: [generator tool commit (ascii) 7 bytes]
-0x80: Start of byte interleaved images
-0x17BB80: [mask config 0x2DB40 bytes] End of images, start of mask config
-0x1A96C0: ROM data
+0x100: Start of byte interleaved images
+0x2F7700: [mask config 0x2DB40 bytes] End of images, start of mask config
+0x325240: ROM data
 ```
 
 0000_1101_11 -> 00_0011_0111