diff --git a/source/op/pt/comm.cc b/source/op/pt/comm.cc
index e234f9d57a..343820320d 100644
--- a/source/op/pt/comm.cc
+++ b/source/op/pt/comm.cc
@@ -234,7 +234,22 @@ std::vector<torch::Tensor> border_op(const torch::Tensor& sendlist_tensor,
                                      const torch::Tensor& g1_tensor,
                                      const torch::Tensor& communicator_tensor,
                                      const torch::Tensor& nlocal_tensor,
-                                     const torch::Tensor& nghost_tensor) {
+                                     const torch::Tensor& nghost_tensor) 
+
+/**
+   * @brief communicate the latest g1 info to other lmp proc
+   * @param[out] recv_g1_tensor g1 after communication
+   * @param[in]  sendlist_tensor list of atoms to send in each swap
+   * @param[in]  sendproc_tensor proc to send to at each swap
+   * @param[in]  recvproc_tensor proc to recv from at each swap
+   * @param[in]  sendnum_tensor # of atoms to send in each swap
+   * @param[in]  recvnum_tensor # of atoms to recv in each swap
+   * @param[in]  g1_tensor tensor to store g1 info
+   * @param[in]  communicator_tensor MPI_comm data in lmp
+   * @param[in]  nlocal_tensor # of local atoms
+   * @param[in]  nghost_tensor # of nghost atoms 
+   **/
+                                     {
   return Border::apply(sendlist_tensor, sendproc_tensor, recvproc_tensor,
                        sendnum_tensor, recvnum_tensor, g1_tensor,
                        communicator_tensor, nlocal_tensor, nghost_tensor);