diff --git a/docs/refractor-visual-spec.md b/docs/refractor-visual-spec.md
index e335d09..60f4138 100644
--- a/docs/refractor-visual-spec.md
+++ b/docs/refractor-visual-spec.md
@@ -222,7 +222,7 @@ L-shaped corner brackets on all four card corners.
 
 1. **Diamond indicator CSS** (`.tier-diamond`, `.diamond-quad`, keyframes) → add to card template stylesheet
 2. **Diamond HTML generation** → add to Playwright card renderer (4 divs in a grid)
-3. **Metallic + glow effect** → always apply metallic class + glow animation to filled diamonds
+3. **Metallic effect** → always apply metallic class to filled diamonds; apply glow animation (`diamond-glow` class) for T4 only
 4. **T3 shimmer** → APNG capture with `--anim-progress` variable (8 frames)
 5. **T4 layered effects** → APNG capture with `--anim-progress` driving all 4 layers
 6. **Diamond colors** → store in tier config or derive from tier level