diff --git a/changelog.d/19323.misc b/changelog.d/19323.misc
new file mode 100644
index 0000000000..6699d7ea54
--- /dev/null
+++ b/changelog.d/19323.misc
@@ -0,0 +1 @@
+Make it more clear how `shared_extra_conf` is combined in our Docker configuration scripts.
diff --git a/docker/configure_workers_and_start.py b/docker/configure_workers_and_start.py
index c03f2a5e56..0ebee49b9d 100755
--- a/docker/configure_workers_and_start.py
+++ b/docker/configure_workers_and_start.py
@@ -879,8 +879,8 @@ def generate_worker_files(
         # worker.
         shared_config = {
             **worker_config["shared_extra_conf"],
-            # We combine `shared_config` second to avoid overwriting existing keys
-            # because TODO: why?
+            # We combine `shared_config` second to avoid overwriting existing keys just
+            # for sanity sake (always use the first worker).
             **shared_config,
         }