diff --git a/src/widgets/ComparisonView/ui/Line/Line.svelte b/src/widgets/ComparisonView/ui/Line/Line.svelte
index 4721a1e..92350b2 100644
--- a/src/widgets/ComparisonView/ui/Line/Line.svelte
+++ b/src/widgets/ComparisonView/ui/Line/Line.svelte
@@ -1,7 +1,8 @@
 <!--
     Component: Line
     Renders one laid-out line as three regions: a fontA bulk run (past the
-    slider), an N-char crossfade window straddling it, and a fontB bulk run (not
+    slider), a crossfade window straddling it (its size derived per line from
+    the line's grapheme count via `windowSizeForLine`), and a fontB bulk run (not
     yet past). Bulk runs are native shaped text (kerning, ligatures); only the
     window uses per-char DOM. `split` is a primitive so the render-model
     `$derived` skips recomputation on ticks that leave it unchanged.