diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5bf0577..c6362213 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ Features
 
 - Decrease minor GC time by only tracing globals when one of them has changed.
 
+- Added the `thread-join!` function to `(srfi 18)`.
+
 ## 0.5.2 - June 5, 2017
 
 Bug Fixes