diff --git a/guide/src/reference/receiving-js-closures-in-rust.md b/guide/src/reference/receiving-js-closures-in-rust.md
index 6d78d5ec..bf463285 100644
--- a/guide/src/reference/receiving-js-closures-in-rust.md
+++ b/guide/src/reference/receiving-js-closures-in-rust.md
@@ -29,3 +29,6 @@ impl VecU32 {
     }
 }
 ```
+
+Since Rust has no function overloading, the `call#` method also requires a
+number representing the amount of arguments passed to the JavaScript closure.