diff --git a/comment-sample/src/extension.ts b/comment-sample/src/extension.ts
index 7a568359..dbc35811 100644
--- a/comment-sample/src/extension.ts
+++ b/comment-sample/src/extension.ts
@@ -12,7 +12,7 @@ export function activate(context: vscode.ExtensionContext) {
 
 	// commenting range provider
 	commentController.commentingRangeProvider = {
-		provideCommentingRange: (document: vscode.TextDocument, token: vscode.CancellationToken) => {
+		provideCommentingRanges: (document: vscode.TextDocument, token: vscode.CancellationToken) => {
 			let lineCount = document.lineCount;
 			return [new vscode.Range(0, 0, lineCount - 1, 0)];
 		}
diff --git a/comment-sample/src/typings/vscode.proposed.d.ts b/comment-sample/src/typings/vscode.proposed.d.ts
index 2adccff0..88f4ba18 100644
--- a/comment-sample/src/typings/vscode.proposed.d.ts
+++ b/comment-sample/src/typings/vscode.proposed.d.ts
@@ -131,7 +131,7 @@ declare module 'vscode' {
 	}
 
 	export interface CommentingRangeProvider {
-		provideCommentingRange(document: TextDocument, token: CancellationToken): ProviderResult<Range[]>;
+		provideCommentingRanges(document: TextDocument, token: CancellationToken): ProviderResult<Range[]>;
 	}
 
 	export interface EmptyCommentThreadFactory {