diff --git a/halo2_gadgets/src/ecc.rs b/halo2_gadgets/src/ecc.rs
index 38fab0a49a..e703337046 100644
--- a/halo2_gadgets/src/ecc.rs
+++ b/halo2_gadgets/src/ecc.rs
@@ -1,5 +1,5 @@
 //! Elliptic curve operations.
-
+// test error
 use std::fmt::Debug;
 
 use halo2_proofs::{