diff --git a/README.md b/README.md
index 3bda79f9f..7bb0ccc24 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,7 @@ large majority of use cases.
 
 ### Features that would improve Whippet performance
 
- - [ ] Immix-style opportunistic evacuation
+ - [X] Immix-style opportunistic evacuation
  - [ ] Overflow allocation
  - [ ] Generational GC via sticky mark bits
  - [ ] Generational GC with semi-space nursery