diff --git a/docs/sap-spec/SPEC_COVERAGE.md b/docs/sap-spec/SPEC_COVERAGE.md
index ee70169b..d233a498 100644
--- a/docs/sap-spec/SPEC_COVERAGE.md
+++ b/docs/sap-spec/SPEC_COVERAGE.md
@@ -108,12 +108,13 @@ Status now: 100-cert MAE 4.49, 300-cert MAE 5.45, bias near zero (±0.2). Worksh
 | — | `internal_gains_from_cert` orchestrator | ✅ | `f81e744b` |
 | — | 6-fixture ALL_FIXTURES conformance | ✅ | `99e5c2cd` |
 | — | `cert_to_inputs` wiring + calculator.py wiring | ✅ | `bf6a7e04` |
+| — | Rooflight Z_L=1.0 (Table 6d note 2) | ✅ | `380115e2` |
 
-**Six Elmhurst fixtures conform end-to-end on §5 to ≤0.2 W on (73)** with the only meaningful residual on (67) (~0.2 W lighting bias from rooflight Z_L=1.0 being approximated as AVERAGE Z_L=0.83 — Table 6d note 2).
+**Six Elmhurst fixtures conform end-to-end on §5 to ≤5e-3 W on every line** — display-rounding territory across the board.
 
 ### Remaining §5 work
 
-1. **Rooflight Z_L=1.0** per Table 6d note 2 (currently a single AVERAGE Z_L applies to all windows including rooflights).
-2. **Table 5a fan / PIV / HIU branches** are implemented as leaf functions but not yet derived from cert inputs in `internal_gains_from_cert`. Pump dispatch is wired; non-pump rows always emit 0 W. MVHR / MEV correctly produces zero gain.
-3. **Per-window `frame_material` / `glazing_type` strings** — current orchestrator uses cert numeric codes; needs a robust mapping for site-notes-sourced certs.
+1. **Table 5a fan / PIV / HIU branches** are implemented as leaf functions but not yet derived from cert inputs in `internal_gains_from_cert`. Pump dispatch is wired; non-pump rows always emit 0 W. MVHR / MEV correctly produces zero gain.
+2. **Per-window `frame_material` / `glazing_type` strings** — current orchestrator uses cert numeric codes; needs a robust mapping for site-notes-sourced certs.
+3. **Rooflight derivation from cert** — orchestrator accepts `rooflight_total_area_m2` but `cert_to_inputs` doesn't yet detect rooflights (defaults to 0). Needs the `SapWindow.window_location` enum that's TODO'd in the domain model.
 4. **Column B reduced-gain forms** (L12a / L16) for new-build DPER/TPER calculations — deferred until we onboard a new-build cert.