diff --git a/.trellis/workspace/dingkang/index.md b/.trellis/workspace/dingkang/index.md
index df90a0a..55ebe47 100644
--- a/.trellis/workspace/dingkang/index.md
+++ b/.trellis/workspace/dingkang/index.md
@@ -8,7 +8,7 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 7
+- **Total Sessions**: 8
 - **Last Active**: 2026-08-03
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~154 | Active |
+| `journal-1.md` | ~175 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 8 | 2026-08-03 | Clean stale tuft density comment | `f569d45` | `main` |
 | 7 | 2026-08-03 | Add feature registry dispatch | `ff18217` | `main` |
 | 6 | 2026-08-03 | Extract road assembly module | `0f3c1ee` | `main` |
 | 5 | 2026-08-03 | Extract building module | `032922a` | `main` |
diff --git a/.trellis/workspace/dingkang/journal-1.md b/.trellis/workspace/dingkang/journal-1.md
index 10f03c7..040e96c 100644
--- a/.trellis/workspace/dingkang/journal-1.md
+++ b/.trellis/workspace/dingkang/journal-1.md
@@ -152,3 +152,24 @@ Introduced blender/osmassets/features.py with FeatureHandler and dispatch_ways f
 ### Status
 
 [OK] **Completed**
+
+
+## Session 8: Clean stale tuft density comment
+
+**Date**: 2026-08-03
+**Task**: Clean stale tuft density comment
+**Branch**: `main`
+
+### Summary
+
+Cleared stale D3 tuft_density_wave comment debt and updated parity guide known-defect records without changing executable scene generation logic. Verified py_compile, 51 pure tests, and task validation.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `f569d45` | (see git log) |
+
+### Status
+
+[OK] **Completed**