diff --git a/App-Development-Guide.md b/App-Development-Guide.md
index 8e131fb..aeddda3 100644
--- a/App-Development-Guide.md
+++ b/App-Development-Guide.md
@@ -8,7 +8,7 @@ Of course we must start with a classic.
### app.js
-```
+```js
app.setDocument('Hello, world!
');
```
@@ -35,7 +35,7 @@ Let's take advantage of code running on the server and create a little hit count
### app.js
-```
+```js
async function main() {
let db = await shared_database('visitors');
let count = parseInt((await db.get('visitors')) ?? '0') + 1;
@@ -66,7 +66,7 @@ Suppose you don't want to create your entire app in a single server-side file as
### app.js
-```
+```js
async function main() {
let html = utf8Decode(await getFile('index.html'));
app.setDocument(html);
@@ -77,7 +77,7 @@ main();
### index.html
-```
+```html
@@ -90,7 +90,7 @@ main();
### script.js
-```
+```js
window.addEventListener('load', function() {
document.body.appendChild(document.createTextNode('Hello, world');
});
@@ -110,7 +110,7 @@ While making calls between the client and the server, it is possible to pass fun
### app.js
-```
+```js
import * as tf from '/tfrpc.js';
function sum() {
@@ -130,7 +130,7 @@ main();
### index.html
-```
+```html
Calculating...
@@ -141,7 +141,7 @@ main();
### script.js
-```
+```js
import * as tf from '/static/tfrpc.js';
window.addEventListener('load', async function() {