diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5493447..e9026bf 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -22,9 +22,9 @@ Every change, from a person or an AI agent, follows the same path:
 | Setting | Value |
 |---|---|
 | Root directory | repo root |
-| Build command | `pnpm install --frozen-lockfile && pnpm test && pnpm --filter website build` |
+| Build command | optional: `apps/website/wrangler.jsonc` has a `build.command` that installs, builds the site and runs the post-build checks before every deploy and preview |
 | Deploy command | `pnpm --filter website exec wrangler deploy` |
-| Other branches | `pnpm --filter website exec wrangler versions upload` (a preview URL per branch) |
+| Other branches | `npx wrangler preview` (Cloudflare's default; gives each branch a preview URL, and needs the `previews` block in `wrangler.jsonc`) |
 
 Node comes from `.nvmrc` and pnpm from `packageManager` in `package.json`. A failing test or post-build check stops the deploy.
 
diff --git a/apps/website/wrangler.jsonc b/apps/website/wrangler.jsonc
index 4ccf7b0..055043f 100644
--- a/apps/website/wrangler.jsonc
+++ b/apps/website/wrangler.jsonc
@@ -4,6 +4,11 @@
   "main": "worker/index.ts",
   "compatibility_date": "2026-10-28",
   "workers_dev": true,
+  // Wrangler builds the site before every deploy and preview, so CI needs no separate build step.
+  // `pnpm install` is a no-op when dependencies are already installed.
+  "build": {
+    "command": "pnpm install --frozen-lockfile && pnpm run build"
+  },
   // Static assets are served first; the Worker only runs when no asset matches.
   "assets": {
     "directory": "./dist",
@@ -12,5 +17,8 @@
   },
   // www.jscebu.org is attached as a Workers Custom Domain (Cloudflare manages its DNS
   // record and certificate). The apex jscebu.org still redirects to www via Vercel.
-  "routes": [{ "pattern": "www.jscebu.org", "custom_domain": true }]
+  "routes": [{ "pattern": "www.jscebu.org", "custom_domain": true }],
+  // Required by `wrangler preview`, which Workers Builds runs for non-production branches.
+  // Empty: previews reuse the top-level assets and compatibility settings, and get no routes.
+  "previews": {}
 }