diff --git a/packages/decision/src/index.ts b/packages/decision/src/index.ts
index 7b92f96..9ad56ee 100644
--- a/packages/decision/src/index.ts
+++ b/packages/decision/src/index.ts
@@ -80,9 +80,12 @@ export interface ErShadowResult {
   latencyMs?: number;
 }
 
-/** Shadow-gate: 0PT_DECISION_ER_SHADOW=1 (OFF by default — fire-and-forget). */
+/** Shadow-gate: OPT_DECISION_ER_SHADOW=1 (OFF by default — fire-and-forget).
+ *  Coolify avvisar env-nycklar som borjar med siffra ("0PT_..."), sa gaten
+ *  heter OPT_DECISION_ER_SHADOW; det gamla 0PT_-namnet accepteras for
+ *  bakatkompatibilitet (t.ex. systemd/docker-miljor utan Coolify). */
 export function erAutoMatchShadowEnabled(): boolean {
-  return process.env["0PT_DECISION_ER_SHADOW"] === "1";
+  return process.env.OPT_DECISION_ER_SHADOW === "1" || process.env["0PT_DECISION_ER_SHADOW"] === "1";
 }
 
 /**