diff --git a/ROMImages/AtariST/readme.txt b/ROMImages/AtariST/readme.txt
index 2a40ac2d3..fe85a762b 100644
--- a/ROMImages/AtariST/readme.txt
+++ b/ROMImages/AtariST/readme.txt
@@ -1,4 +1,13 @@
-THIS EMULATOR DOES NOT EMULATE THE ATARI ST.
+# Emulation
+
+ROM files would ordinarily go here; the copyright status of these is uncertain so they have not been included in this repository.
+
+Expected files:
+
+tos100.img; a 196kb image of the UK Atari ST TOS 1.00 ROM.
+
+
+# Test Cases.
 
 Included here are Atari ST-targeted versions of EmuTOS, being a significant chunk of freely available and redistributable 68000 code that can be used to test the 68000-in-progress.