diff --git a/doc/dev/features/auditing.md b/doc/dev/features/auditing.md
new file mode 100644
index 0000000..12d1ea2
--- /dev/null
+++ b/doc/dev/features/auditing.md
@@ -0,0 +1,6 @@
+# About tracing and telemetry
+
+Every request to pixiv websites should go through core/requests.go.
+
+Every request to pixiv websites is traced.
+Every server request is traced.