diff --git a/src/vs/base/parts/quickinput/common/quickInput.ts b/src/vs/base/parts/quickinput/common/quickInput.ts
index c3443a3180d..2b08cceb208 100644
--- a/src/vs/base/parts/quickinput/common/quickInput.ts
+++ b/src/vs/base/parts/quickinput/common/quickInput.ts
@@ -145,9 +145,9 @@ export interface IInputOptions {
 	value?: string;
 
 	/**
-	 * the selection of value, default to the whole word
+	 * the selection of value, default to the whole prefilled value
 	 */
-	valueSelection?: [number, number];
+	valueSelection?: readonly [number, number];
 
 	/**
 	 * the text to display underneath the input box
@@ -164,6 +164,9 @@ export interface IInputOptions {
 	 */
 	password?: boolean;
 
+	/**
+	 * an optional flag to not close the input on focus lost
+	 */
 	ignoreFocusLost?: boolean;
 
 	/**
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index e352a3bc53d..8c2ab9090c4 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -555,6 +555,8 @@ export interface TransferInputBox extends BaseTransferQuickInput {
 
 	value?: string;
 
+	valueSelection?: Readonly<[number, number]>;
+
 	placeholder?: string;
 
 	password?: boolean;
@@ -569,7 +571,7 @@ export interface TransferInputBox extends BaseTransferQuickInput {
 export interface IInputBoxOptions {
 	title?: string;
 	value?: string;
-	valueSelection?: [number, number];
+	valueSelection?: Readonly<[number, number]>;
 	prompt?: string;
 	placeHolder?: string;
 	password?: boolean;
diff --git a/src/vs/workbench/api/common/extHostQuickOpen.ts b/src/vs/workbench/api/common/extHostQuickOpen.ts
index 6d7ab756c8c..afb34a578e7 100644
--- a/src/vs/workbench/api/common/extHostQuickOpen.ts
+++ b/src/vs/workbench/api/common/extHostQuickOpen.ts
@@ -687,6 +687,7 @@ export function createExtHostQuickOpen(mainContext: IMainContext, workspace: IEx
 
 		private _password = false;
 		private _prompt: string | undefined;
+		private _valueSelection: readonly [number, number] | undefined;
 		private _validationMessage: string | InputBoxValidationMessage | undefined;
 
 		constructor(extension: IExtensionDescription, onDispose: () => void) {
@@ -712,6 +713,15 @@ export function createExtHostQuickOpen(mainContext: IMainContext, workspace: IEx
 			this.update({ prompt });
 		}
 
+		get valueSelection() {
+			return this._valueSelection;
+		}
+
+		set valueSelection(valueSelection: readonly [number, number] | undefined) {
+			this._valueSelection = valueSelection;
+			this.update({ valueSelection });
+		}
+
 		get validationMessage() {
 			return this._validationMessage;
 		}
diff --git a/src/vscode-dts/vscode.d.ts b/src/vscode-dts/vscode.d.ts
index 045afad03cb..c346e7df8ea 100644
--- a/src/vscode-dts/vscode.d.ts
+++ b/src/vscode-dts/vscode.d.ts
@@ -2018,7 +2018,7 @@ declare module 'vscode' {
 		/**
 		 * Selection of the pre-filled {@linkcode InputBoxOptions.value value}. Defined as tuple of two number where the
 		 * first is the inclusive start index and the second the exclusive end index. When `undefined` the whole
-		 * word will be selected, when empty (start equals end) only the cursor will be set,
+		 * pre-filled value will be selected, when empty (start equals end) only the cursor will be set,
 		 * otherwise the defined range will be selected.
 		 */
 		valueSelection?: [number, number];
@@ -11316,7 +11316,7 @@ declare module 'vscode' {
 		value: string;
 
 		/**
-		 * Optional placeholder in the filter text.
+		 * Optional placeholder shown in the filter textbox when no filter has been entered.
 		 */
 		placeholder: string | undefined;
 
@@ -11408,7 +11408,18 @@ declare module 'vscode' {
 		value: string;
 
 		/**
-		 * Optional placeholder in the filter text.
+		 * Selection range in the input value. Defined as tuple of two number where the
+		 * first is the inclusive start index and the second the exclusive end index. When `undefined` the whole
+		 * pre-filled value will be selected, when empty (start equals end) only the cursor will be set,
+		 * otherwise the defined range will be selected.
+		 *
+		 * This property does not get updated when the user types or makes a selection,
+		 * but it can be updated by the extension.
+		 */
+		valueSelection: readonly [number, number] | undefined;
+
+		/**
+		 * Optional placeholder shown when no value has been input.
 		 */
 		placeholder: string | undefined;