diff --git a/skill/SKILL.md b/skill/SKILL.md
index 35d153904..32906ff60 100644
--- a/skill/SKILL.md
+++ b/skill/SKILL.md
@@ -65,6 +65,7 @@ Two hard typographic ceilings you currently miss:
 - Use libraries for more advanced motion needs (e.g. motion, gsap, anime.js, lenis etc)
 - Reduced motion is not optional. Every animation needs a `@media (prefers-reduced-motion: reduce)` alternative: typically a crossfade or instant transition.
 - Sibling stagger on a list (cards, list items) is legitimate. Whole-section fade-on-scroll on every scrolled section is not a list; it's the saturated AI motion reflex.
+- Reveal animations must enhance an already-visible default. Don't gate content visibility on a class-triggered transition; transitions pause on hidden tabs and headless renderers, so the reveal never fires and the section ships blank.
 - Premium motion materials are not just transform/opacity. Blur, backdrop-filter, clip-path, mask, and shadow/glow are part of the palette when they materially improve the effect and stay smooth.
 
 #### Interaction