diff --git a/guide/src/reference/attributes/on-rust-exports/typescript_custom_section.md b/guide/src/reference/attributes/on-rust-exports/typescript_custom_section.md
index 16bb3bd1b60..b2f98e0e4ac 100644
--- a/guide/src/reference/attributes/on-rust-exports/typescript_custom_section.md
+++ b/guide/src/reference/attributes/on-rust-exports/typescript_custom_section.md
@@ -7,12 +7,22 @@ string to the `.d.ts` file exported by `wasm-bindgen-cli` (when the
 ```rust
 #[wasm_bindgen(typescript_custom_section)]
 const TS_APPEND_CONTENT: &'static str = r#"
-
 export type Coords = { "latitude": number, "longitude": number, }; 
-
 "#;
 ```
 
+It's also possible to put type definitions in a separate file:
+
+```rust
+#[wasm_bindgen(typescript_custom_section)]
+const TS_APPEND_CONTENT: &'static str = include_str!("./coords.d.ts");
+```
+
+```typescript
+// ./coords.d.ts
+export type Coords = { "latitude": number, "longitude": number, }; 
+```
+
 The primary target for this feature is for code generation. For example, you
 can author a macro that allows you to export a TypeScript definition alongside
 the definition of a struct or Rust type.