diff --git a/conductor/tracks/context_comp_slices_20260510/plan.md b/conductor/tracks/context_comp_slices_20260510/plan.md
index dd20a26..4942623 100644
--- a/conductor/tracks/context_comp_slices_20260510/plan.md
+++ b/conductor/tracks/context_comp_slices_20260510/plan.md
@@ -15,7 +15,7 @@ Focus: Visual AST highlighting with file content
 - [x] Task 2.3: Implement toggle buttons for each AST element in the content view [976b241]
 - [x] Task 2.4: Write tests for slice inspector rendering [976b241]
 
-## Phase 3: Slice Editor Visual Enhancement
+## Phase 3: Slice Editor Visual Enhancement [checkpoint: 4f0f436]
 Focus: Visual slice editor with colored overlays
 
 - [x] Task 3.1: Enhance slice editor to show file content (not just line list) [3614e11]