diff --git a/CHANGES.md b/CHANGES.md
index 6620d3d..4b6f71a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@
 
 ### Changed
 
+- Upgrade `eio` to `1.0` (no change required).
 - Uses `expect-test-helpers` (reduce core dependencies)
 - Upgrade `eio` to `0.15`.
 - Run `ppx_js_style` as a linter & make it a `dev` dependency.