1 files changed, 3 insertions, 0 deletions
diff --git a/src/temporal-ambient.d.ts b/src/temporal-ambient.d.ts
index c5ec34f..38e69d4 100644
--- a/src/temporal-ambient.d.ts
+++ b/src/temporal-ambient.d.ts
@@ -10,6 +10,7 @@ declare global {
 		};
 
 		interface Duration {
+			readonly days: number;
 			total(options: { unit: 'millisecond' | 'day' }): number;
 		}
 		namespace Duration {
@@ -47,6 +48,8 @@ declare global {
 			readonly dayOfWeek: number;
 			add(durationLike: DurationLike): PlainDate;
 			subtract(durationLike: DurationLike): PlainDate;
+			/** Difference to another date; largest unit defaults to days. */
+			until(other: PlainDate): Duration;
 			toZonedDateTime(timeZone: TimeZoneId): ZonedDateTime;
 			toString(): string;
 		}