diff --git a/types/office-js-preview/index.d.ts b/types/office-js-preview/index.d.ts
index 48d6cfd3f8..4cbc3ac299 100644
--- a/types/office-js-preview/index.d.ts
+++ b/types/office-js-preview/index.d.ts
@@ -21662,8 +21662,12 @@ declare namespace Excel {
         set(properties: Excel.Range): void;
         /**
          *
-         * Fills range from the current range to the destination range.
-            The destination range must extend the source either horizontally or vertically. Discontiguous ranges are not supported.
+         * Fills range from the current range to the destination range using the specified AutoFill logic. 
+         * The destination range can be null, or can extend the source either horizontally or vertically. 
+         * If the destination range is null, data is filled out based on the surrounding cells (which is the behavior when double-clicking the UI’s range fill handle). 
+         * Discontiguous ranges are not supported.
+         * 
+         * For more information, read {@link https://support.office.com/article/video-use-autofill-and-flash-fill-2e79a709-c814-4b27-8bc2-c4dc84d49464 | Use AutoFill and Flash Fill}.
          *
          * [Api set: ExcelApi 1.9]
          *
@@ -21673,8 +21677,12 @@ declare namespace Excel {
         autoFill(destinationRange: Range | string, autoFillType?: Excel.AutoFillType): void;
         /**
          *
-         * Fills range from the current range to the destination range.
-            The destination range must extend the source either horizontally or vertically. Discontiguous ranges are not supported.
+         * Fills range from the current range to the destination range using the specified AutoFill logic. 
+         * The destination range can be null, or can extend the source either horizontally or vertically. 
+         * If the destination range is null, data is filled out based on the surrounding cells (which is the behavior when double-clicking the UI’s range fill handle). 
+         * Discontiguous ranges are not supported.
+         * 
+         * For more information, read {@link https://support.office.com/article/video-use-autofill-and-flash-fill-2e79a709-c814-4b27-8bc2-c4dc84d49464 | Use AutoFill and Flash Fill}.
          *
          * [Api set: ExcelApi 1.9]
          *
diff --git a/types/office-js/index.d.ts b/types/office-js/index.d.ts
index 3da4c80d1d..69531afc54 100644
--- a/types/office-js/index.d.ts
+++ b/types/office-js/index.d.ts
@@ -18876,8 +18876,12 @@ declare namespace Excel {
         set(properties: Excel.Range): void;
         /**
          *
-         * Fills range from the current range to the destination range.
-            The destination range must extend the source either horizontally or vertically. Discontiguous ranges are not supported.
+         * Fills range from the current range to the destination range using the specified AutoFill logic. 
+         * The destination range can be null, or can extend the source either horizontally or vertically. 
+         * If the destination range is null, data is filled out based on the surrounding cells (which is the behavior when double-clicking the UI’s range fill handle). 
+         * Discontiguous ranges are not supported.
+         * 
+         * For more information, read {@link https://support.office.com/article/video-use-autofill-and-flash-fill-2e79a709-c814-4b27-8bc2-c4dc84d49464 | Use AutoFill and Flash Fill}.
          *
          * [Api set: ExcelApi 1.9]
          *
@@ -18887,8 +18891,12 @@ declare namespace Excel {
         autoFill(destinationRange: Range | string, autoFillType?: Excel.AutoFillType): void;
         /**
          *
-         * Fills range from the current range to the destination range.
-            The destination range must extend the source either horizontally or vertically. Discontiguous ranges are not supported.
+         * Fills range from the current range to the destination range using the specified AutoFill logic. 
+         * The destination range can be null, or can extend the source either horizontally or vertically. 
+         * If the destination range is null, data is filled out based on the surrounding cells (which is the behavior when double-clicking the UI’s range fill handle). 
+         * Discontiguous ranges are not supported.
+         * 
+         * For more information, read {@link https://support.office.com/article/video-use-autofill-and-flash-fill-2e79a709-c814-4b27-8bc2-c4dc84d49464 | Use AutoFill and Flash Fill}.
          *
          * [Api set: ExcelApi 1.9]
          *