diff --git a/hardware/LAYOUT_REFERENCES.md b/hardware/LAYOUT_REFERENCES.md
index f8b6ba8..96d4f6c 100644
--- a/hardware/LAYOUT_REFERENCES.md
+++ b/hardware/LAYOUT_REFERENCES.md
@@ -100,3 +100,13 @@ principles. Two of these are essentially our exact circuit.
 
 Hand these (plus `LAYOUT.md`) to whoever routes the board; they cover every stage where
 layout — not schematic — determines whether it works.
+
+## Saved locally (in `hardware/datasheets/`, git-ignored)
+The three priority references are downloaded for offline use:
+- **`TPS65131EVM_SLVUAW7.pdf`** — switcher EVM, includes the full **4-layer PCB plots**
+  (Top / Inner 1 / Inner 2 / Bottom) + BOM (which matches our TPS65131RGER / 4.7 µH / MBRM120).
+  *Copy this layout for the switcher block.*
+- **`TPS7A30-49EVM_SLVU405.pdf`** — the ±15 V dual-LDO EVM (schematic + layout + thermal + BOM).
+- **`RP2350-Minimal-KiCAD.zip`** — official RP2350 reference. **Nested:** unzip it, then extract
+  `RP-006440-...RP2350A Minimal Board Kicad archive.zip` (RP2350A / QFN-60 = our part) for the
+  schematic + PCB + footprints; the `RP-006442` archive is the QFN-80 (RP2350B) variant.