diff --git a/docs/re/BACKLOG.md b/docs/re/BACKLOG.md
index 75cac0b..84cd241 100644
--- a/docs/re/BACKLOG.md
+++ b/docs/re/BACKLOG.md
@@ -206,10 +206,13 @@ See [`structures/ui-composable-bundles.md`](structures/ui-composable-bundles.md)
   separation is *shape*, or which bundle references which, and the PAK cannot
   answer the latter directly because its entries are name-hashed.
   ✅ **By-product:** the header is not dead space. `+0x18`/`+0x1c` are the
-  **design resolution** (1280/720 on 98.7 %, asserted), and 🟡 `+0x04` takes only
-  `0x3C0000`/`0x1E0000` — exactly **60.0/30.0 in 16.16** — with `+0x08` at
-  30/1200/120/60, i.e. a frame rate and a duration in frames. That last reading
-  is from the values alone and is unverified against an animation.
+  **design resolution** (1280/720 on 98.7 %, asserted), and ✅ `+0x08` is the
+  **animation length** — checked against the keyframe times, which it bounds in
+  **2 313 of 2 313** bundles and is attained by **444**, with the ratio peaking
+  at 1.0 rather than near zero (that histogram is what rules out a vacuous
+  bound). 🟡 `+0x04` (`0x3C0000`/`0x1E0000` = 60.0/30.0 in 16.16) stays amber:
+  the only supporting evidence is that the twelve 30.0 bundles cap at `+0x08`=30
+  while the 2 843 60.0 ones reach 1 440. ❔ `+0x0c` and `+0x10` unexplained.
   See [`structures/ui-rat-layout.md`](structures/ui-rat-layout.md).
 * 🟡 **What `opt ` links — a record→record reference** (2026-08-24, measured
   disc-wide and asserted). All **1 467** links reachable from a declaration table