diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 9b981d69fc0..49f3e46437c 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -4251,6 +4251,7 @@ declare namespace Intl {
         maximumFractionDigits?: number;
         minimumSignificantDigits?: number;
         maximumSignificantDigits?: number;
+        notation?: string;
     }
 
     interface ResolvedNumberFormatOptions {
@@ -4265,6 +4266,7 @@ declare namespace Intl {
         minimumSignificantDigits?: number;
         maximumSignificantDigits?: number;
         useGrouping: boolean;
+        notation?: string;
     }
 
     interface NumberFormat {
diff --git a/tests/lib/lib.d.ts b/tests/lib/lib.d.ts
index 9edbdec2b1b..5bbe688910f 100644
--- a/tests/lib/lib.d.ts
+++ b/tests/lib/lib.d.ts
@@ -3898,6 +3898,7 @@ declare module Intl {
         maximumFractionDigits?: number;
         minimumSignificantDigits?: number;
         maximumSignificantDigits?: number;
+        notation?: string;
     }
 
     interface ResolvedNumberFormatOptions {
@@ -3912,6 +3913,7 @@ declare module Intl {
         minimumSignificantDigits?: number;
         maximumSignificantDigits?: number;
         useGrouping: boolean;
+        notation?: string;
     }
 
     interface NumberFormat {