diff --git a/cloud/nucleic-edge/src/heartbeat.ts b/cloud/nucleic-edge/src/heartbeat.ts
index e1d0b701..cc1342fb 100644
--- a/cloud/nucleic-edge/src/heartbeat.ts
+++ b/cloud/nucleic-edge/src/heartbeat.ts
@@ -47,7 +47,7 @@ export function parseHeartbeat(body: unknown): ParseResult {
   if (!channel || !CHANNELS.has(channel)) return { ok: false, error: "channel" };
 
   // Remaining dimensions are best-effort: default to "unknown" rather than reject,
-  // so a valid DAU is never dropped over a missing minor field.
+  // so a valid DAI is never dropped over a missing minor field.
   const osVersion = str(b.osVersion) ?? "unknown";
   const appVersion = str(b.appVersion) ?? "unknown";
   const build = str(b.build) ?? "unknown";