diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3f5a17a..8b6d9aab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ All notable changes to this project will be documented in this file.
 ## Unreleased
 - Add API compatibility checking for modules. This will let native modules not load
   when the host program is not of a compatible version or configuration.
+- Change signature of `os/execute` to be much more flexible.
 
 ## 0.6.0 - 2019-05-29
 - `file/close` returns exit code when closing file opened with `file/popen`.