diff --git a/docs/plan/level-assets.md b/docs/plan/level-assets.md
index d46774a..da9e79b 100644
--- a/docs/plan/level-assets.md
+++ b/docs/plan/level-assets.md
@@ -1576,3 +1576,48 @@ cover something else, or cover a subset of cells. Resolving it needs either the
 same offset found in other levels at a position the leading counts predict, or a
 reason for 17. Neither exists yet, and this is the point at which the
 measurement trail goes cold on collision.
+
+## overlay.bin: named sections and a 16-aligned debug string table
+
+`level_overlay` was on the open list with no parser and no located structure. It
+now has one: a header naming two sections, and a string table.
+
+**Range measured:** `overlay.bin` on levels 0, 1 and 2 -- 2,751,268,
+2,763,668 and 2,928,424 bytes.
+
+**Result 1 -- the file opens with section names.**
+
+    +000: 80 7c 1a 00 | dc 99 00 00 | 01 00 00 00 | 88 3b 2a 00
+    +010: 00 00 00 00 | 00 00 00 00 | "crap\n"     | 00 00 00 00 00
+    +020: "system misc" 00 00 00 00 00 00 00 00 00
+    +030: 20 80 ff 40 | 00 60 cf 00 | 64 00 | 46 00 | 19 00 00 00
+
+`u32@+0x00` is **1,735,808 on all three levels**, `+0x08` is `1`, and the bytes
+at `+0x18` and `+0x20` spell **"crap"** and **"system misc"**.
+
+**Result 2 -- a debug string table on 16-byte alignment.** 332 such strings on
+level 0, 362 on level 1, 351 on level 2, the first at `+0x20` and the last
+between 1.3 MB and 2.5 MB. They are the game's own debug text:
+
+    host0:r:/rc2/shock/wavetable.bin
+    host0:z:/i5/shock/wavetable1.bin
+    unloaded sound bank %#010x
+    Camera_CollPrimTest WARNING! - grid out of bounds! (RAR)
+    render setup
+    sky draw
+    pre effects
+    pre 2 effects
+
+**`Camera_CollPrimTest WARNING! - grid out of bounds! (RAR)` is direct evidence
+for the collision reading.** It is the game's own string, naming a grid and a
+collision test, and it is why the two leading counts in the collision payload
+are worth continuing to treat as grid dimensions despite not sizing the payload.
+
+The `wavetable.bin` paths also confirm the sound bank is loaded from named
+files, which bears on the `SBlk`/`DAW` framing.
+
+**Not done.** The string table is located and counted but not parsed -- the
+records preceding each string have not been identified, so there is no
+`gc_formats` module for it yet. The `+0x18`/`+0x20` names are section names but
+their structure is not established, and it is not yet shown that they index
+anything.