diff --git a/README.md b/README.md
index 99d5109..960b77e 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Phase 2
 
 - Dave Bakker (@badeend)
 
-### Phase 4 Advancement Criteria
+### Portability Criteria
 
 - At least two independent production implementations.
 - Implementations available for at least Windows, Linux & MacOS.