diff --git a/src/lib/datetime.ts b/src/lib/datetime.ts
index e58ad6f..7dafd50 100644
--- a/src/lib/datetime.ts
+++ b/src/lib/datetime.ts
@@ -106,6 +106,7 @@ export const pprintDateRange = (d1: string | Date | Dayjs, d2: string | Date | D
 
 /**
  * Format the duration between two dates.
+ * The Duration is precise to the minute.
  * Example: "3 Wo, 1 Tag, 2 Std, 53 Min"
  * @param date1
  * @param date2