diff --git a/AGENTS.md b/AGENTS.md
index f045cf1..0ad4395 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -32,6 +32,31 @@ CI produces eight Docker Hub tags per release: `vX.Y.Z[n]`, `latest`, `vX.Y.Z[n]
 
 When bumping the opencode version, bump `OPENCODE_VERSION` in `Dockerfile.variant` and update the comment in `.env.example` if it names a specific model/version for context.
 
+## Upstream sources — where to look up release notes
+
+When drafting a release CHANGELOG entry, pull notes from the **canonical upstream repo for each tracked package**. Getting this wrong leads to thin or wrong release notes; the image bytes are unaffected but the documentation suffers.
+
+| Package | Canonical upstream | What you'll find there |
+|---|---|---|
+| `opencode-ai` (npm) | <https://github.com/anomalyco/opencode/releases> | Per-version release notes with Core / TUI / Desktop / SDK sections, contributor attributions. Some versions have empty bodies (internal/no-user-visible); most do not. |
+| `@earendil-works/pi-coding-agent` (npm) | The `CHANGELOG.md` shipped inside the npm tarball: `npm pack @earendil-works/pi-coding-agent@<version>` then extract `package/CHANGELOG.md`. | Rich changelog with New Features / Added / Changed / Fixed sections per version. |
+| Other floated tools (gosu, fzf, bat, eza, zoxide, uv, nvim, gitea-mcp, Go, oh-my-opencode-slim) | Each project's own GitHub releases page | Usually less material per release; quote selectively. |
+
+**Trap to avoid:** there is a `github.com/sst/opencode` repo that some search results surface; that's a fork (and probably the historical name people associate with opencode given the upstream lineage). It does NOT track the same release timeline. Use `anomalyco/opencode` for opencode release notes.
+
+Fetch pattern (saved here for muscle memory):
+
+```bash
+# Latest stable opencode-ai versions on npm
+npm view opencode-ai time --json | python3 -c 'import sys,json,re; d=json.load(sys.stdin); print(*sorted([(v,t) for v,t in d.items() if re.fullmatch(r"\d+\.\d+\.\d+",v)], key=lambda x:x[1], reverse=True)[:6], sep="\n")'
+
+# Release notes for a specific version
+curl -s https://api.github.com/repos/anomalyco/opencode/releases/tags/v1.15.10 | python3 -c 'import sys,json; print(json.load(sys.stdin).get("body","(empty)"))'
+
+# pi changelog
+cd /tmp && npm pack @earendil-works/pi-coding-agent@0.75.5 && tar -xzf earendil-works-pi-coding-agent-0.75.5.tgz package/CHANGELOG.md && head -40 package/CHANGELOG.md
+```
+
 ## Critical conventions
 
 - **entrypoint.sh volume ownership loop** — when adding a new named volume mount point, add it to the `for dir in ...` loop in `entrypoint.sh` so root-owned volumes get chowned on startup. The loop writes a `.devbox-owner` sentinel after a successful chown so subsequent starts skip the recursive walk. Users should not touch these files.