diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 12d667c74cf..f033c7635f8 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1110,7 +1110,7 @@ declare module 'vscode' {
 		 *
 		 * The primary selection (or focused range) is `selections[0]`. When the document has no cells, the primary selection is empty `{ start: 0, end: 0 }`;
 		 */
-		readonly selections: NotebookRange[];
+		selections: NotebookRange[];
 
 		/**
 		 * The current visible ranges in the editor (vertically).
diff --git a/src/vs/workbench/api/browser/mainThreadNotebookEditors.ts b/src/vs/workbench/api/browser/mainThreadNotebookEditors.ts
index 9777a4bae95..76c0c0a4000 100644
--- a/src/vs/workbench/api/browser/mainThreadNotebookEditors.ts
+++ b/src/vs/workbench/api/browser/mainThreadNotebookEditors.ts
@@ -186,4 +186,12 @@ export class MainThreadNotebookEditors implements MainThreadNotebookEditorsShape
 			notebookEditor.setEditorDecorations(key, range);
 		}
 	}
+
+	$trySetSelections(id: string, ranges: ICellRange[]): void {
+		const editor = this._notebookEditorService.getNotebookEditor(id);
+		if (editor) {
+			// @rebornix how to set an editor selection?
+			// editor.setSelections(ranges)
+		}
+	}
 }
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 550c3547cd0..07850c4c4f6 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -894,6 +894,7 @@ export interface MainThreadNotebookEditorsShape extends IDisposable {
 	$tryRevealRange(id: string, range: ICellRange, revealType: NotebookEditorRevealType): Promise<void>;
 	$registerNotebookEditorDecorationType(key: string, options: INotebookDecorationRenderOptions): void;
 	$removeNotebookEditorDecorationType(key: string): void;
+	$trySetSelections(id: string, range: ICellRange[]): void;
 	$trySetDecorations(id: string, range: ICellRange, decorationKey: string): void;
 	$tryApplyEdits(editorId: string, modelVersionId: number, cellEdits: ICellEditOperation[]): Promise<boolean>
 }
diff --git a/src/vs/workbench/api/common/extHostNotebookEditor.ts b/src/vs/workbench/api/common/extHostNotebookEditor.ts
index a3b7fabf34f..479d1469902 100644
--- a/src/vs/workbench/api/common/extHostNotebookEditor.ts
+++ b/src/vs/workbench/api/common/extHostNotebookEditor.ts
@@ -9,6 +9,7 @@ import * as extHostConverter from 'vs/workbench/api/common/extHostTypeConverters
 import { CellEditType, ICellEditOperation, ICellReplaceEdit } from 'vs/workbench/contrib/notebook/common/notebookCommon';
 import * as vscode from 'vscode';
 import { ExtHostNotebookDocument } from './extHostNotebookDocument';
+import { illegalArgument } from 'vs/base/common/errors';
 
 interface INotebookEditData {
 	documentVersionId: number;
@@ -107,6 +108,13 @@ export class ExtHostNotebookEditor {
 				get selections() {
 					return that._selections;
 				},
+				set selections(value: vscode.NotebookRange[]) {
+					if (!Array.isArray(value) || !value.every(extHostTypes.NotebookRange.isNotebookRange)) {
+						throw illegalArgument('selections');
+					}
+					that._selections = value;
+					that._trySetSelections(value);
+				},
 				get visibleRanges() {
 					return that._visibleRanges;
 				},
@@ -151,6 +159,10 @@ export class ExtHostNotebookEditor {
 		this._selections = selections;
 	}
 
+	private _trySetSelections(value: vscode.NotebookRange[]): void {
+		this._proxy.$trySetSelections(this.id, value.map(extHostConverter.NotebookRange.from));
+	}
+
 	_acceptViewColumn(value: vscode.ViewColumn | undefined) {
 		this._viewColumn = value;
 	}