diff --git a/rootfs/usr/local/share/pi-devbox/skills/pi-devbox-environment/SKILL.md b/rootfs/usr/local/share/pi-devbox/skills/pi-devbox-environment/SKILL.md
index 0a3008e..8e136b3 100644
--- a/rootfs/usr/local/share/pi-devbox/skills/pi-devbox-environment/SKILL.md
+++ b/rootfs/usr/local/share/pi-devbox/skills/pi-devbox-environment/SKILL.md
@@ -146,6 +146,7 @@ mine:
 | "the credential is not in the palace" | scanned `embedding_metadata.string_value` only. Drawer **text** lives in `embedding_fulltext_search_content.c0`; 554k metadata rows proved nothing. |
 | "this token is dead — 401" | probed it against the **wrong issuer**. A 401 from an instance that never issued the credential is not evidence about the credential. |
 | "that host is unreachable, can't test" | tried ports 443 and 80. It was on **3000**, and the env var I already held (`GITEA_EGL_HOST`) stated the scheme and port. |
+| "this repo has no `## Unreleased` convention" | read `CHANGELOG.md` **once**, minutes after a release commit had renamed that section to a version heading. 33 commits touch `## Unreleased`. A snapshot cannot show you a cycle. |
 
 Habits that would have caught all three:
 
@@ -158,6 +159,11 @@ ssh -F "$HOME/.ssh-local/config" mac 'command -v docker || ls /usr/local/bin/doc
 
 # match a process's ACTUAL argv, not the name you imagine
 ps -eo pid,etime,args | grep -Ei 'mux|mosh|ssh'
+
+# to learn a repeating PROCESS or convention, read history, not the file. A
+# file's current content is one frame of a cycle, and the frame you happen to
+# catch may be the one where the thing you are looking for was just consumed.
+git log -S'## Unreleased' -- CHANGELOG.md         # not `head -60 CHANGELOG.md`
 ```
 
 Absence has to be *earned*, so spend the extra command there.