diff --git a/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md b/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
index 5870852f..98a6ae2a 100644
--- a/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
+++ b/docs/research/2026-09-01-overhaul/s5-consumers-material-closeout-packet.md
@@ -395,3 +395,13 @@ change code behavior, tests, register/architecture prose, or any other file.
 Run `git diff --check`, Core particle 47/47, and the combined App/AP-116 41/41;
 commit once and return to the same narrow retail lens. Any further finding that
 would require a third fix round stops S5-c1 and is written up.
+
+### 11.1 Fix-round-2 implementation result
+
+`UseWorldView` now states the production transaction exactly: every non-login
+world frame participates; a PView walk contributes its exact landscape set,
+while a null-root safety frame completes `hasCompletedView=true` with an empty
+set and no reconstructed fallback. Login and portal-space frames retain
+`hasCompletedView=false`. No behavior or assertion changed. Core particle tests
+passed 47/47, the combined App visibility/terrain/frame/renderer plus AP-116
+lane passed 41/41, and `git diff --check` is clean.
diff --git a/src/AcDream.App/Rendering/Vfx/ParticleVisibilityController.cs b/src/AcDream.App/Rendering/Vfx/ParticleVisibilityController.cs
index 5dcb274d..e2e06d5b 100644
--- a/src/AcDream.App/Rendering/Vfx/ParticleVisibilityController.cs
+++ b/src/AcDream.App/Rendering/Vfx/ParticleVisibilityController.cs
@@ -41,11 +41,13 @@ public sealed class ParticleVisibilityController : IWorldSceneParticleVisibility
     }
 
     /// <summary>
-    /// Declares that this frame has the completed retail PView product: one
-    /// viewer position plus its exact walk-owned landscape-cell set. Frames
-    /// without that PView product, including login, portal space, and the
-    /// null-root terrain safety draw, deliberately omit it; dedicated-pass and
-    /// examination emitters carry explicit bypass policies.
+    /// Marks an open non-login world frame as participating in the completed
+    /// visibility transaction. When a retail PView walk exists, its exact
+    /// landscape-cell set is added separately. A null-root safety frame still
+    /// completes with <c>hasCompletedView=true</c> and an empty landscape set;
+    /// it never reconstructs a fallback. Login and portal-space frames retain
+    /// <c>hasCompletedView=false</c>. Dedicated-pass and examination emitters
+    /// carry explicit bypass policies.
     /// </summary>
     public void UseWorldView()
     {