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-rw-r--r--skills/chapter25-codex-notes.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/skills/chapter25-codex-notes.md b/skills/chapter25-codex-notes.md
index fca0d9ed..2f2f299c 100644
--- a/skills/chapter25-codex-notes.md
+++ b/skills/chapter25-codex-notes.md
@@ -78,7 +78,8 @@ For shared viewer work, read [the graph viewer notes](graph-viewer-codex-notes.m
not merely because the canonical declaration has different pointer permissions.
- Construct cyclic pointers with their access bit already set before interning;
creating a provisional pointer and then changing access can orphan temporary
- cyclic types. Serialized objects use the `C0D2` header and require a rebuild.
+ cyclic types. Serialized objects use the unversioned `C0DE` header; rebuild
+ objects after format changes. Backward compatibility is not required yet.
## Tutorial backports