diff --git a/comment-sample/src/extension.ts b/comment-sample/src/extension.ts
index 4bb53c88..2c5d3f2a 100644
--- a/comment-sample/src/extension.ts
+++ b/comment-sample/src/extension.ts
@@ -27,17 +27,15 @@ export function activate(context: vscode.ExtensionContext) {
 		thread.label = 'Create New Note';
 
 		// We will render all `acceptInputCommands` as Actions on the bottom of Comment Widget in the editor.
-		thread.acceptInputCommands = [
-			{
-				title: 'Create Note',
-				command: 'mywiki.createNote',
-				// Command is responsible for arguments
-				arguments: [
-					commentController,
-					thread
-				]
-			}
-		];
+		thread.acceptInputCommand = {
+			title: 'Create Note',
+			command: 'mywiki.createNote',
+			// Command is responsible for arguments
+			arguments: [
+				commentController,
+				thread
+			]
+		};
 	};
 
 	// Register commenting range provider and callback.
@@ -55,16 +53,14 @@ export function activate(context: vscode.ExtensionContext) {
 			thread.label = 'Participants: vscode';
 
 			// After we create the new comment thread, we may want to update the actions on the Comment Widget.
-			thread.acceptInputCommands = [
-				{
-					title: 'Create Comment',
-					command: 'mywiki.createComment',
-					arguments: [
-						commentController,
-						thread
-					]
-				}
-			];
+			thread.acceptInputCommand = {
+				title: 'Create Comment',
+				command: 'mywiki.createComment',
+				arguments: [
+					commentController,
+					thread
+				]
+			};
 
 			// Lastly, we want to clear the textarea in Comment Widget.
 			commentController.inputBox.value = '';
diff --git a/comment-sample/src/typings/vscode.proposed.d.ts b/comment-sample/src/typings/vscode.proposed.d.ts
index 522dce06..85c9ab6e 100644
--- a/comment-sample/src/typings/vscode.proposed.d.ts
+++ b/comment-sample/src/typings/vscode.proposed.d.ts
@@ -55,7 +55,17 @@ declare module 'vscode' {
 		 * The ordered comments of the thread.
 		 */
 		comments: Comment[];
-		acceptInputCommands?: Command[];
+		/**
+		 * `acceptInputCommand` is the default action rendered on Comment Widget, which is always placed rightmost.
+		 * It will be executed when users submit the comment from keyboard shortcut.
+		 * This action is disabled when the comment editor is empty.
+		 */
+		acceptInputCommand?: Command;
+
+		/**
+		 * `additionalCommands` are the secondary actions rendered on Comment Widget.
+		 */
+		additionalCommands?: Command[];
 
 		/**
 		 * Whether the thread should be collapsed or expanded when opening the document. Defaults to Collapsed.