Add some missing docs

docs/bundler/executables.md

@@ -586,12 +586,41 @@ Codesign support requires Bun v1.2.4 or newer.
 
 {% /callout %}
 
+## Code splitting
+
+Standalone executables support code splitting. Use `--compile` with `--splitting` to create an executable that loads code-split chunks at runtime.
+
+```bash
+$ bun build --compile --splitting ./src/entry.ts --outdir ./build
+```
+
+{% codetabs %}
+
+```ts#src/entry.ts
+console.log("Entrypoint loaded");
+const lazy = await import("./lazy.ts");
+lazy.hello();
+```
+
+```ts#src/lazy.ts
+export function hello() {
+  console.log("Lazy module loaded");
+}
+```
+
+{% /codetabs %}
+
+```bash
+$ ./build/entry
+Entrypoint loaded
+Lazy module loaded
+```
+
 ## Unsupported CLI arguments
 
 Currently, the `--compile` flag can only accept a single entrypoint at a time and does not support the following flags:
 
-- `--outdir` — use `outfile` instead.
-- `--splitting`
+- `--outdir` — use `outfile` instead (except when using with `--splitting`).
 - `--public-path`
 - `--target=node` or `--target=browser`
 - `--no-bundle` - we always bundle everything into the executable.