diff --git a/internal/ceres/partitioned_matrix_view.cc b/internal/ceres/partitioned_matrix_view.cc
index ae16f03..fcf8fd5 100644
--- a/internal/ceres/partitioned_matrix_view.cc
+++ b/internal/ceres/partitioned_matrix_view.cc
@@ -283,6 +283,7 @@
 // vector multiply its an outer product.
 //
 //   block_diagonal = block_diagonal(F'F)
+//
 void PartitionedMatrixView::UpdateBlockDiagonalFtF(
     BlockSparseMatrix* block_diagonal) const {
   const CompressedRowBlockStructure* bs = matrix_.block_structure();