diff --git a/readme.md b/readme.md
index 4f27782..fc148fd 100644
--- a/readme.md
+++ b/readme.md
@@ -9,11 +9,11 @@ https://ahti.space/git/crazyettin/Thingamajig.
 System requirements
 -------------------
 
-Gidubba requires at least 4 KiB of RAM. It uses a terminal with local
-echo at address FFFF, and optionally a character printer at address FFFE
-and a punched tape reader and punch or a casette drive at FFFD. Do not
-be afraid to modify the code yourself if your setup requires it! (And if
-you do, apologies for the spaghetti.)
+Gidubba requires at least 4 KiB of RAM. It uses an ASCII-compatible
+terminal with local echo at address FFFF, and optionally a character
+printer at address FFFE and a paper tape reader and punch or a casette
+drive at FFFD. Do not be afraid to modify the code yourself if your
+setup requires it! (And if you do, apologies for the spaghetti.)
 
 Format
 ------