diff --git a/docs/gaps.md b/docs/gaps.md
index 705a09de..2af858ff 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -20,7 +20,7 @@ Hours are Opus 5.5 agent wall-clock hours (see [target-app-parity.md](target-app
 | 3 B | **Render fidelity unmeasured** (LR-BEHAV-RENDER-FIDELITY): tone, highlights, texture / clarity / dehaze, NR and sharpening are tuned by eye | no side-by-side suite; a retune needs a new process version (only V1 exists) | edits imported from Lightroom look different; the look "isn't Lightroom's" | 30–60 | [raw-parity](raw-parity.md), [process-versions](process-versions.md) |
 | 4 B | **Original-pixel detail at 100%** (LR-VIEW-ZOOM, P0): Detail, Before/After, Compare and Reference are sharp at 1:1–8:1 (zoom windows, #323). Mask overlays and soft proofing still render the whole frame at the drawn size instead of a window: sharp up to the GPU texture side, but a full-size render per edit at 1:1 | checklist row 🟡 | editing with a mask overlay or soft proof on at 1:1 is slow on large files, and blurry past the texture side | 4–8 | [ui-parity](ui-parity.md) |
 | 5 B | **AI masks: Subject, Sky, People, Background, Landscape** are heuristics; Object / Describe run SAM 3 but its download has no mirror configured | `crates/segment`; ai-masks.md; MASK rows 67% | masking is how most Lightroom users edit today | 40–70 + model decision | [target-app-parity](target-app-parity.md#ai) |
-| 6 B | **Compressed ORF** (every Olympus / OM body since ~2008) | measured: 66 of 78 Olympus / OM models preview-only; `orf.rs` refuses; OM bucket 3% of photographers, 3% of them fully work | +2.6 points; best gain per hour of any raw gap (~0.2) | 8–15 | [raw-parity](raw-parity.md) |
+| 6 B | **Compressed ORF** (every Olympus / OM body since ~2008) | measured: 66 of 78 Olympus / OM models preview-only; `orf.rs` refuses; OM bucket 3% of photographers, 3% of them fully work | +2.6 points; best gain per hour of any raw gap (~0.2) | 8–15 | [raw-parity](raw-parity.md#compressed-orf-a-clean-room-starting-point) (the two Olympus patents that describe the method) |
 | 7 | **Nikon High Efficiency NEF** (HE / HE★ on Z 8, Z 9, Z 6III, Z f, Z50II, Z5II when set to HE) | named and preview only (#193); needs a pure-Rust JPEG XS decoder | +1.1 points (only shots taken in HE; lossless works on the same bodies); low gain per hour (~0.04), so not a beta blocker | 20–40 | [raw-parity](raw-parity.md) |
 | 8 B | **No lens profile database** (LR-EDIT-OPTICS-PROFILE): only DNG opcodes, RW2 in-file distortion and Sony ILCE-7RM4A distortion | Adobe ships 3,635 lens profiles; we never use them | distortion / vignetting correction is a default step for many | 40–80 + calibration shots | [raw-parity](raw-parity.md#lens-profiles) |
 | 9 B | **Tests don't run in CI on macOS, Windows or Linux x64**: only FreeBSD runs `cargo test`; the others build packages | `.github/workflows/` (freebsd, packaging-lint, release, windows-arm64); the linux-riscv64 release job added in 0.6.0 (#844) runs only `lightcraft-cli --version` under QEMU | regressions reach users on the main platforms; `cargo xtask ci` runs only locally | 6–12 | [target-app-parity](target-app-parity.md#by-dimension) |
@@ -75,6 +75,7 @@ Beta-blocking gaps (B) total **~230–430 h**; with the stability and platform w
 | 2026-10-11 | minor | Reviewed against main after 0.6.0: CR3 entry names the CRX variants `crx.rs` still refuses and the R7 / R6 Mark II C-RAW state (decoding, not verified, so the measured numbers don't move); CI and Windows / Linux entries note the riscv64 release build (#844); R7 fix added to Closed recently. Panel docking (UI.9, #869) closes no listed gap |
 | 2026-10-11 | minor | Camera colour entry: raws with a black-and-white camera JPEG take its tone curve (#577); gap not closed |
 | 2026-10-11 | minor | Gap 4: Compare and Reference views get zoom windows per pane (1:1 was a 2,560 px render magnified); overlays and soft proofing remain, 8–15 h → 4–8 h |
+| 2026-10-10 | minor | Compressed ORF entry links the two Olympus patents that describe the method |
 | 2026-10-10 | minor | RAW gaps re-measured model by model (raw-parity.md): CR3, compressed ORF and verification entries carry measured shares; HE NEF no longer a beta blocker (+1.1 points for 20–40 h); verification entry absorbs the cheap per-body fixes (#769, #702, A200 series) |
 | 2026-10-10 | minor | Beta total raised to 340–600 h to include the ~92 open core-path user issues |
 | 2026-10-10 | major | Created from the checklist's Top gaps (whose items 1–2 had been duplicated by a merge) and ROADMAP's Where we stand; re-ranked; added evidence, impact, hours and beta flags; added platform-CI, lens-database, HE NEF and localization gaps |
diff --git a/docs/raw-parity.md b/docs/raw-parity.md
index ca5cbcfd..265e4a09 100644
--- a/docs/raw-parity.md
+++ b/docs/raw-parity.md
@@ -145,6 +145,21 @@ checked, and Canon, the largest bucket, is the weakest of the big four.
 | IIQ, MOS, MRW, ERF, KDC, X3F | all | ⬜ | preview |
 | DCR, MEF, MFW, DXO, GPR, TIFF raws | all | ⬜ | not imported |
 
+### Compressed ORF: a clean-room starting point
+
+Two Olympus patents by Takashi Ishikawa describe the *method* of lossless RAW compression in prose; neither names ORF
+and neither gives the file layout. See the closed #240 and the open #360 for why a decoder has to be derived from the
+files and prose rather than from dcraw-family code.
+
+- [US7333035B2](https://patents.google.com/patent/US7333035): lossless RAW compression for SLR cameras:
+  median-edge-detector prediction from the left, upper and upper-left neighbours, a separately coded sign, Golomb-Rice
+  codes whose parameter `k` comes from flatness run counters, counters reset per line.
+- [US7715639B2](https://patents.google.com/patent/US7715639B2/en): a sibling with predictor variants, `k` derived from
+  neighbouring positions, raw low-order bits and a correction filter.
+
+They give the algorithm's shape; constants, the bit layout and the stream header still have to be established from CC0
+sample files. A pointer for contributors, not legal advice.
+
 ## Demosaic, levels, crops and lens metadata
 
 | Stage | Target | LightCraft | Status |
@@ -249,5 +264,6 @@ Beyond decoding:
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-10 | minor | Compressed ORF: pointer to the two Olympus patents that describe the method, as a clean-room starting point |
 | 2026-10-10 (later) | major | Model-by-model measurement against Adobe's published list (1,446 models: 234 verified, 943 unverified, 233 preview, 36 unsupported); `docs/raw/` data and re-measure script; use-weighted share 84% (40% on verified bodies); variant matrix; colour and lens sections with scores; ranked next cameras; RAW readiness ~56% from written parts |
 | 2026-10-10 | major | Created: formats, makers, demosaic, colour and lens checklists; target counts from the installed Lightroom 9.6 bundle listing |