diff --git a/substrate/utils/wasm-builder-runner/src/lib.rs b/substrate/utils/wasm-builder-runner/src/lib.rs
index b0b1ac479e..410af87546 100644
--- a/substrate/utils/wasm-builder-runner/src/lib.rs
+++ b/substrate/utils/wasm-builder-runner/src/lib.rs
@@ -403,6 +403,8 @@ fn create_project(
 		project_folder.join("src/main.rs"),
 		format!(
 			r#"
+				//! This is automatically generated code by `substrate-wasm-builder`.
+
 				use substrate_wasm_builder::build_project_with_default_rustflags;
 
 				fn main() {{