diff --git a/_build-log.md b/_build-log.md
index affce5b..3360a30 100644
--- a/_build-log.md
+++ b/_build-log.md
@@ -15,6 +15,15 @@
 
 ---
 
+## Video 5 — Skill Index
+**Date:** 2026-04-02
+**Index state:** All current skills documented (drafts-inbox, daily-briefing, shutdown-routine, weekly-review, file-organizer, robot-assistant-assembler, skill-creator, pro-dev-justification)
+**Routing preference:** Always check index before starting any task
+**Planned future skills:** None reserved at this time
+**Files updated:** skills/_skill-index.md (confirmed current), AGENTS.md (already had always-check instruction)
+
+---
+
 ## Video 4 — First Skill
 **Date:** 2026-04-02
 **Skill:** pro-dev-justification