diff --git a/moment/moment-node.d.ts b/moment/moment-node.d.ts
index 51e11f1329..fe576a1828 100644
--- a/moment/moment-node.d.ts
+++ b/moment/moment-node.d.ts
@@ -379,11 +379,17 @@ declare module moment {
         meridiem?: (hour: number, minute: number, isLowercase: boolean) => string;
         calendar?: MomentCalendar;
         ordinal?: (num: number) => string;
+        week?: MomentLanguageWeek
     }
 
     interface MomentLanguage extends BaseMomentLanguage {
         longDateFormat?: MomentLongDateFormat;
     }
+    
+    interface MomentLanguageWeek {
+        dow?: number;
+        doy?: number;
+    }
 
     interface MomentLanguageData {
         /**
diff --git a/moment/moment-tests.ts b/moment/moment-tests.ts
index ed392c83ee..2ac484ca25 100644
--- a/moment/moment-tests.ts
+++ b/moment/moment-tests.ts
@@ -315,6 +315,10 @@ moment.locale('en', {
             (b === 1) ? 'st' :
             (b === 2) ? 'nd' :
             (b === 3) ? 'rd' : 'th';
+    },
+    week: {
+        dow: 1,
+        doy: 4
     }
 });