diff --git a/conductor/tracks/context_comp_slices_20260510/plan.md b/conductor/tracks/context_comp_slices_20260510/plan.md
index f5ed61c..2a99482 100644
--- a/conductor/tracks/context_comp_slices_20260510/plan.md
+++ b/conductor/tracks/context_comp_slices_20260510/plan.md
@@ -1,6 +1,6 @@
 # Implementation Plan: Context Composition Slice Visualization
 
-## Phase 1: Slice Data Model Extension
+## Phase 1: Slice Data Model Extension [checkpoint: 4a20489]
 Focus: Extend custom_slices to support tags and comments
 
 - [x] Task 1.1: Extend custom_slices schema to include tag and comment fields [976879d]