diff --git a/reference/configuration/options.md b/reference/configuration/options.md
index 99d318e5..bb6d6552 100644
--- a/reference/configuration/options.md
+++ b/reference/configuration/options.md
@@ -65,6 +65,21 @@ threads:
 - `maxHeapMemory` — Heap limit per thread (MB)
 - `heapSnapshotNearLimit` — Write a `.heapsnapshot` file when a thread nears its heap limit (loadable in Chrome DevTools Memory tab); _Default_: `false`. See [Worker Thread Debugging](./debugging.md#heap-snapshots-near-the-limit)
 - `debug` — Enable Node.js inspector; sub-options: `port`, `startingPort`, `host`, `waitForDebugger`. See [Worker Thread Debugging](./debugging.md)
+- `preload` <VersionBadge version="v5.2.0" /> — Module, or list of modules, to load (via Node's `--require`) before any Harper or application module on each worker thread. Intended for instrumentation/APM agents (e.g. `dd-trace`) that must load first to instrument subsequent module loads. Bare specifiers (e.g. `dd-trace/init`) resolve against the `node_modules` of your installed [components](../components/overview.md) — so the agent can be shipped as a dependency of a deployed component — and absolute paths are also accepted. Applies to worker threads only (not under Bun).
+
+```yaml
+threads:
+  preload: dd-trace/init
+```
+
+Or several modules:
+
+```yaml
+threads:
+  preload:
+    - dd-trace/init
+    - /opt/instrumentation/agent.js
+```
 
 ---