diff --git a/docs/superpowers/specs/2026-08-05-movementtest-longitudinal-time-step-design.md b/docs/superpowers/specs/2026-08-05-movementtest-longitudinal-time-step-design.md
index 1d4d52a..1d80fc3 100644
--- a/docs/superpowers/specs/2026-08-05-movementtest-longitudinal-time-step-design.md
+++ b/docs/superpowers/specs/2026-08-05-movementtest-longitudinal-time-step-design.md
@@ -16,6 +16,7 @@ Add configurable `TimeHorizonSeconds` and `OutputTimeStepSeconds` values to the
 - Expose both settings in the MovementTest as public fields with defaults of `6d` and `0.10d`.
 - Copy both values to the session-local `EmPlannerConfiguration.Scheduling` configuration.
 - Verify custom settings reach the planning request and non-positive values are rejected.
+- Add Chinese XML documentation comments to the MovementTest fields and settings properties, explaining horizon coverage, timestamp spacing, defaults, and the distinction from `ObserverPeriodSeconds`.
 
 ## Non-goals