diff --git a/README.md b/README.md
index 5e907f27b..a0455cbe6 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ including
 - the Watara Supervision console.
 - the Oric Atmos.
 - the Lynx console.
-- the Ohio Scientific Challenger 1P
+- the Ohio Scientific Challenger 1P.
 
 The libraries are fairly portable, so creating a version for other 6502s
 shouldn't be too much work.