diff --git a/CLAUDE.md b/CLAUDE.md
index 60bcbae..ae36f35 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -96,12 +96,12 @@ ourselves".
   as alpha-blend on GfxObj surfaces — falsifiable; if a magic-content
   regression shows up, add a third indirect call with
   `glBlendFunc(SrcAlpha, One)` per spec §6 fallback (~30 min change).
-- **Per-instance highlight (selection blink) is reserved.** `mesh_modern.vert`'s
-  `InstanceData` struct has a documented hook for `vec4 highlightColor`
-  — Phase B.4 follow-up adds the field + plumbs server-side selection
-  state. Stride grows from 64 → 80 bytes when added; shader updates
-  trivially (read the field from `Instances[instanceIndex]` + mix into
-  fragment color).
+- **Per-instance highlight (selection blink) is reserved — open
+  backlog, no scheduled phase.** `mesh_modern.vert`'s `InstanceData`
+  struct has a documented hook for `vec4 highlightColor`. Whoever
+  eventually picks it up finds the hook there; the change is localized:
+  extend `InstanceData` stride 64→80 bytes, add the field, mix into
+  fragment color in `mesh_modern.frag`. ~30 min when the time comes.
 
 **Execution phases:** R1→R8 in the architecture doc. Each phase has clear
 goals, test criteria, and builds on the previous. Don't skip phases.
diff --git a/docs/superpowers/plans/2026-05-08-phase-n5-modern-rendering.md b/docs/superpowers/plans/2026-05-08-phase-n5-modern-rendering.md
index 43abd7c..e6fc047 100644
--- a/docs/superpowers/plans/2026-05-08-phase-n5-modern-rendering.md
+++ b/docs/superpowers/plans/2026-05-08-phase-n5-modern-rendering.md
@@ -2434,7 +2434,7 @@ Append to this plan file (`docs/superpowers/plans/2026-05-08-phase-n5-modern-ren
 - N.6: retire `InstancedMeshRenderer`.
 - N.6 candidate: persistent-mapped buffers if `glBufferData` shows up in profiling.
 - N.6 candidate: WB atlas adoption for memory savings on shared content.
-- Phase B.4 follow-up: per-instance `highlightColor` for selection blink.
+- Open backlog (no scheduled phase): per-instance `highlightColor` for retail-faithful selection blink — field reserved in `mesh_modern.vert`; whoever picks it up later finds the hook.
 - (Long-session memory pressure — log evidence in N.6 watchlist.)
 ```
 
@@ -2618,8 +2618,11 @@ adjustments captured beyond the plan:
   walls, etc).
 - **GPU-side culling** via compute pre-pass.
 - **Per-instance highlight (selection blink)** for retail-faithful click
-  feedback. Field reserved in `mesh_modern.vert`'s `InstanceData` struct
-  comment; `Phase B.4 follow-up` ticket.
+  feedback — **open backlog, no scheduled phase.** Field reserved in
+  `mesh_modern.vert`'s `InstanceData` struct comment; whoever eventually
+  wants it finds the hook there. Change is localized: extend
+  `InstanceData` stride 64→80 bytes, add `vec4 highlightColor` field,
+  mix into fragment color. ~30 min when the time comes.
 
 ### Memory