diff --git a/CHANGELOG.md b/CHANGELOG.md
index 07914f5c..d938c9f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,12 @@ Every session now makes the next one smarter. gstack remembers patterns, pitfall
 - **Learnings count in preamble.** Every skill now shows "LEARNINGS: N entries loaded" during startup.
 - **5-release roadmap design doc.** `docs/designs/SELF_LEARNING_V0.md` maps the path from R1 (GStack Learns) through R4 (/autoship, one-command full feature) to R5 (Studio).
 
+## [0.13.5.1] - 2026-03-29 — Gitignore .factory
+
+### Changed
+
+- **Stop tracking `.factory/` directory.** Generated Factory Droid skill files are now gitignored, same as `.claude/skills/` and `.agents/`. Removes 29 generated SKILL.md files from the repo. The `setup` script and `bun run build` regenerate these on demand.
+
 ## [0.13.5.0] - 2026-03-29 — Factory Droid Compatibility
 
 gstack now works with Factory Droid. Type `/qa` in Droid and get the same 29 skills you use in Claude Code. This makes gstack the first skill library that works across Claude Code, Codex, and Factory Droid.