diff --git a/tests/include/test/helpers.h b/tests/include/test/helpers.h
index 93a3e11323..c0677a99d4 100644
--- a/tests/include/test/helpers.h
+++ b/tests/include/test/helpers.h
@@ -291,7 +291,6 @@ void mbedtls_test_err_add_check( int high, int low,
  *
  * \return \c 0 on success, an \c MBEDTLS_ERR_MPI_xxx error code otherwise.
  */
-/* Since the library has exactly the desired behavior, this is trivial. */
 int mbedtls_test_read_mpi( mbedtls_mpi *X, const char *s );
 #endif /* MBEDTLS_BIGNUM_C */