diff --git a/README.md b/README.md
index dcbdfa4..558fb5d 100644
--- a/README.md
+++ b/README.md
@@ -10,5 +10,5 @@ its own HDL depending on how much I love Scala. :)
 ## TODO
 
 * Generate PCFs on demand via board descriptions.
-* CXXRTL/cxxsim.
 * Parameterise correctly for ECP5.
+* CXXRTL blackbox types: ✅ Vec; ❌ anything not one bit wide.