diff --git a/docs/re/structures/savegame-format.md b/docs/re/structures/savegame-format.md
index 1877e471..afdbf291 100644
--- a/docs/re/structures/savegame-format.md
+++ b/docs/re/structures/savegame-format.md
@@ -668,4 +668,47 @@ figure is the 8 header words that are both pointer-shaped and moving.
 I am leaving the earlier section in place with this correction after it, because
 the mistake is instructive: a value-range classifier on 32-bit words will always
 have a false-positive rate, and quoting its raw count as a fact about the format
-is the error.
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+is the error.
+
+## ❌❌ CORRECTION — my two sections above analysed the COMPRESSED stream
+
+**Same day, immediately after.** Both preceding sections split the file at
+`0x88` and called everything after it "the slot table". That is wrong, and this
+page already says so further up: the container is `GDHA` + a **146-byte header**
++ a **zlib stream**, and `savegame.rs` has implemented that all along. `0x88`
+is where the `Z1`/zlib payload begins — `5a31` is `Z1`, `78da` is the zlib
+header — so the bytes I was treating as slot fields are **compressed data**.
+
+What that invalidates, precisely:
+
+* ❌ **The "6 pointer-shaped words in the slot region"** are not words and not
+  pointers. They are deflate output. Classifying compressed bytes by value range
+  is meaningless, and the "false-positive rate" I drew from them measured
+  nothing.
+* 🟡 **"The slot region is byte-identical between the two saves"** is *true* but
+  for a different reason than I gave: the two **compressed streams** are
+  identical. That does still imply identical payloads — a deterministic deflate
+  of the same input — and inflating both confirms it directly: **545 bytes,
+  byte-for-byte equal**. So the conclusion survives; the reasoning did not.
+* ✅ **"All 12 differing words are in the header"** stands, and is now better
+  founded: the header is the only *uncompressed* region, so it is the only place
+  a word-wise diff means anything at all.
+
+**The useful result, done correctly.** Inflating all three payloads (545 bytes
+each, declared size matching in 3 of 3):
+
+    stage02-5pct      ... 00000005 ...   payload identical to game02
+    game02-samestate  ... 00000005 ...
+    game03-developed  ... 00000006 ...   and 0x00001005 -> 0x00000065
+
+`5 → 6` on a developed weapon is exactly the **clear-ratio** behaviour this page
+already documents at payload `+8`, reproduced here from the captures. That is a
+confirmation of an existing reading, not a new one.
+
+### The lesson worth keeping
+
+I found `Z1`/`78da` by inspection and was one step from writing it up as a
+discovery. It was already decoded, in this same file, four sections above where
+I was appending. **Reading the whole page before analysing its subject would
+have saved two wrong commits** — and the wrongness was not cosmetic: an entire
+pointer census ran over deflate output and produced a plausible-looking table.
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