diff --git a/comment-sample/src/typings/vscode.d.ts b/comment-sample/src/typings/vscode.d.ts
new file mode 100644
index 00000000..e809e20d
--- /dev/null
+++ b/comment-sample/src/typings/vscode.d.ts
@@ -0,0 +1,38 @@
+declare module 'vscode' {
+
+	/**
+	 * Reactions of a [comment](#Comment)
+	 */
+	export interface CommentReaction {
+		/**
+		 * The human-readable label for the reaction
+		 */
+		readonly label: string;
+
+		/**
+		 * Icon for the reaction shown in UI.
+		 */
+		readonly iconPath: string | Uri;
+
+		/**
+		 * The number of users who have reacted to this reaction
+		 */
+		readonly count: number;
+
+		/**
+		 * Whether the [author](CommentAuthorInformation) of the comment has reacted to this reaction
+		 */
+		readonly authorHasReacted: boolean;
+	}
+
+	export interface Comment {
+		reactions?: CommentReaction[];
+	}
+
+	export interface CommentController {
+		/**
+		 *
+		 */
+		reactionHandler?: (comment: Comment, reaction: CommentReaction) => Promise<void>;
+	}
+}
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