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diff --git a/README.md b/README.md
index 1875e5c..bdd1887 100644
--- a/README.md
+++ b/README.md
@@ -5,5 +5,7 @@ Extra code for when running on JavaScript
 ## Features
 
 - Arrays
+- Mutable references
+- Promises
 - Symbols
 - `typeof`