diff --git a/README.md b/README.md
index 20b39f9..9f717e3 100644
--- a/README.md
+++ b/README.md
@@ -14,9 +14,9 @@ WASI-io is currently in [Phase 2].
 
 ### Portability Criteria
 
-wasi-io must have host implementations which can pass the testsuite on at least Windows, macOS, and Linux.
+WASI io must have host implementations which can pass the testsuite on at least Windows, macOS, and Linux.
 
-wasi-io must have at least two complete independent implementations.
+WASI io must have at least two complete independent implementations.
 
 ## Table of Contents