diff --git a/previewhtml-sample/README.md b/previewhtml-sample/README.md
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--- a/previewhtml-sample/README.md
+++ b/previewhtml-sample/README.md
@@ -1,10 +1,19 @@
+# :rotating_light: Deprecated
+
+Please use the new Webview API instead:
+
+- Guide: https://code.visualstudio.com/docs/extensions/webview
+- Sample: https://github.com/Microsoft/vscode-extension-samples/tree/master/webview-sample
+
 # CSS Properties Preview Sample
+
 This is an sample extension that illustrates the use of virtual documents or `TextDocumentContentProviders` together with the `vscode.previewHtml`
 [command](https://code.visualstudio.com/docs/extensionAPI/vscode-api-commands#_commands).
 
 It is not intended as a product quality extension.
 
 The purpose of the extension is to show a preview of the properties in the declaration block of a CSS rule. To play with the extension:
+
 - Open a CSS file
 - Use `Show CSS Properties Preview`
 - Position the cursor inside the declaration block of the rule
@@ -22,6 +31,6 @@ The purpose of the extension is to show a preview of the properties in the decla
 
 # How to run locally
 
-* `npm install`
-* `npm run compile` to start the compiler in watch mode
-* open this folder in VS Code and press `F5`
+- `npm install`
+- `npm run compile` to start the compiler in watch mode
+- open this folder in VS Code and press `F5`