diff --git a/server/sim/Battle.js b/server/sim/Battle.js
index caa9b20f..09806a12 100644
--- a/server/sim/Battle.js
+++ b/server/sim/Battle.js
@@ -1626,6 +1626,10 @@ export class Battle {
     return out;
   }
 
+  /**
+   * Every deployed ally within `r` of (x, y) — no selection rule: an enemy's area effect selects among them with
+   * targeting.js areaSelectable (content/enemies.js areaAllies: no unblocking 隐匿 ally, DESIGN §22.12).
+   */
   alliesInRadius(x, y, r, ownerId = null, { includeDevices = false } = {}) {
     const out = [];
     const r2 = r * r + 1e-9;