diff --git a/cpp/mwmatching.h b/cpp/mwmatching.h
index a98bc7f..9fffe4a 100644
--- a/cpp/mwmatching.h
+++ b/cpp/mwmatching.h
@@ -1231,7 +1231,7 @@ public:
         assert(path.edges.size() % 2 == 1);
         assert(path.edges.size() >= 3);
 
-        // Construct the list of sub-blossoms.
+        // Collect pointers to sub-blossoms.
         std::vector<BlossomT*> subblossoms;
         subblossoms.reserve(path.edges.size());
         for (VertexPair edge : path.edges) {
@@ -1277,8 +1277,8 @@ public:
         }
 
         // Merge concatenable queues.
-// TODO -- avoid temporary array
         std::vector<VertexQueueT*> subqueues;
+        subqueues.reserve(subblossoms.size());
         for (BlossomT* sub : subblossoms) {
             subqueues.push_back(&sub->vertex_queue);
         }