diff --git a/protobuf_deps.bzl b/protobuf_deps.bzl
index 558540cc7f..19c51746e0 100644
--- a/protobuf_deps.bzl
+++ b/protobuf_deps.bzl
@@ -43,6 +43,8 @@ def protobuf_deps():
         _github_archive(
             name = "com_google_absl",
             repo = "https://github.com/abseil/abseil-cpp",
+            # TODO: use Layout::WithStaticSizes in SerialArenaChunk when we update
+            # abseil to new release.
             commit = "4a2c63365eff8823a5221db86ef490e828306f9d",  # Abseil LTS 20240116.0
             sha256 = "f49929d22751bf70dd61922fb1fd05eb7aec5e7a7f870beece79a6e28f0a06c1",
         )