diff --git a/internal/ceres/block_jacobi_preconditioner.cc b/internal/ceres/block_jacobi_preconditioner.cc
index 29974d4..19b749b 100644
--- a/internal/ceres/block_jacobi_preconditioner.cc
+++ b/internal/ceres/block_jacobi_preconditioner.cc
@@ -94,7 +94,9 @@
       //
       //   MatrixRef(blocks_[cells[c].block_id],
       //             col_block_size,
-      //             col_block_size).selfadjointView<Eigen::Upper>().rankUpdate(m);
+      //             col_block_size)
+      //      .selfadjointView<Eigen::Upper>()
+      //      .rankUpdate(m);
       //
     }
   }