diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8db4f13..d6478ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ SPDX-License-Identifier: MIT
 # Unreleased
 
 - Prepare supporting multiple parser backends.
+- Read the `$CARGO_TARGET_DIR` and `$CARGO_BUILD_TARGET_DIR` environment
+  variables to determine the Cargo target directory.
 
 ## v0.4.2 (2021-06-06)