diff --git a/frontend/src/utils/sessionDuration.ts b/frontend/src/utils/sessionDuration.ts
index a23607b..7ba303c 100644
--- a/frontend/src/utils/sessionDuration.ts
+++ b/frontend/src/utils/sessionDuration.ts
@@ -1,4 +1,4 @@
-"""Human-readable session_duration_sec for event tables."""
+/** Human-readable session_duration_sec for event tables. */
 
 export function formatSessionDuration(seconds: number | null | undefined): string {
   if (seconds == null || !Number.isFinite(seconds) || seconds < 0) {