diff --git a/docs/api/async-runtime-state-new.md b/docs/api/async-runtime-state-new.md
index ed8c6ed..b675912 100644
--- a/docs/api/async-runtime-state-new.md
+++ b/docs/api/async-runtime-state-new.md
@@ -41,6 +41,7 @@ Detailed rules explaining key parameters and behaviors
 - It does not query the current backend automatically.
 - `async_runtime_state()` is the higher-level API that reads these values from the live runtime environment.
 - It also does not validate whether the supplied pair matches the current backend contract.
+- The supplied `mode` and `background_worker` values are stored exactly as provided; this constructor does not recompute, normalize, or cross-check either field.
 - The constructed value matches the same public shape used by async runtime serializers.
 - Because `AsyncRuntimeState` is only a data snapshot type, this constructor is mainly useful for tests, adapters, and synthetic diagnostics rather than ordinary runtime probing.
 
@@ -77,6 +78,8 @@ e.g.:
 
 - If callers manually pair `NativeWorker` with `false` or `Compatibility` with `true`, the constructor still accepts that snapshot because it does not enforce backend consistency.
 
+- If callers want the currently probed runtime pair instead of a synthetic one, they must pass `async_runtime_mode()` plus `async_runtime_supports_background_worker()` explicitly or use `async_runtime_state()`.
+
 ### Notes
 
 1. Use this helper when code should construct an `AsyncRuntimeState` value explicitly.