Added a comment.

diff --git a/mtp_graph.cc b/mtp_graph.cc
index 6fb3877..a7b942d 100644 (file)
--- a/mtp_graph.cc
+++ b/mtp_graph.cc
@@ -457,6 +457,9 @@ void MTPGraph::compute_dp_ordering() {
   }
 
   while(already_processed < front) {
+    // Here, nodes before already_processed can be ignored, nodes
+    // before front were set to 0 predecessors during the previous
+    // iteration. We will add the 
     new_front = front;
     while(already_processed < front) {
       v = *(already_processed++);