Limb darkening for the sun

readme.md

@@ -145,7 +145,7 @@ M1 is complete: the library renders Earth, Moon, Sun and targets to DN
 through `Renderer`, the CLI renders scene files, and the benchmarks give the
 L0 / C0 baseline above. M2 is in progress: lighting L1 so far draws Earth's
 surface from Blue Marble, shadows on the target, light from Earth and the
-Moon on it, and eclipses on Earth and the Moon. The work is tracked as
+Moon on it, eclipses on Earth and the Moon, and the Sun's limb darkening. The work is tracked as
 Gitea milestones, each split into one issue per change:
 
 | Milestone | Scope |