diff --git a/packages/vscode-ext/README.md b/packages/vscode-ext/README.md
index 61861e5f..68b7d7bc 100644
--- a/packages/vscode-ext/README.md
+++ b/packages/vscode-ext/README.md
@@ -25,6 +25,9 @@ Check out the full list of Squiggle settings in the main VS Code settings.
 
 ## Usage
 
+After loading a `.squiggle` file, an "Open Preview" button will appear. If you click it, the squiggle model will be shown, and updated as you edit and save you file.
+
+![](./images/extension-screenshot.png)
 
 ## Build locally
 
diff --git a/packages/vscode-ext/images/extension-screenshot.png b/packages/vscode-ext/images/extension-screenshot.png
new file mode 100644
index 00000000..f3cc3351
Binary files /dev/null and b/packages/vscode-ext/images/extension-screenshot.png differ