diff --git a/src/ChangeLog b/src/ChangeLog
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,12 @@
 2011-01-13    <guravage@petitdru.sen.cwi.nl>
 
+	* transporterdialog.cpp (TransporterDialog): Use wn to discern
+	which cell a wallitem belongs to.
+
+	* wallitem.cpp (WallItem): Add a comment explaining how
+	wallnumber(wn) can be used to tell which cell a wallitem belongs
+	to.
+
 	* VirtualLeaf-install-windows.nsi: Remove previous change that added icon directory.
 
 	* canvas.cpp: Instead of using a separate icon directory, compile
diff --git a/src/transporterdialog.cpp b/src/transporterdialog.cpp
--- a/src/transporterdialog.cpp
+++ b/src/transporterdialog.cpp
@@ -42,8 +42,10 @@ TransporterDialog::TransporterDialog(Wal
 
   // compose a label describing the cells and nodes associated with this wall
   std::stringstream desc; 
-  desc << "between cells "<< wall->C1()->Index() << " and " << wall->C2()->Index() << ", and" << endl <<
-          "connecting nodes " << wall->N1()->Index() << " and " << wall->N2()->Index();
+
+  desc << "Transporters for cell "<< ((wall_num == 1) ? wall->C1() : wall->C2())->Index()
+       << "; adjacent to cell " << ((wall_num == 2) ? wall->C1() : wall->C2())->Index() << "," << endl
+       << "and connecting nodes " << wall->N1()->Index() << " and " << wall->N2()->Index() << ".";
 
   // description label
   label = new QLabel;
@@ -92,7 +94,7 @@ TransporterDialog::TransporterDialog(Wal
   layout->addLayout(b_grid);
   setLayout(layout);
 
-  setWindowTitle(QString("Edit Transporters"));
+  setWindowTitle(QString("Edit Cell Transporters"));
 }
 
 void TransporterDialog::setTransporterValues()
diff --git a/src/wallitem.cpp b/src/wallitem.cpp
--- a/src/wallitem.cpp
+++ b/src/wallitem.cpp
@@ -34,6 +34,7 @@ static const std::string _module_id("$Id
 WallItem::WallItem( Wall *w, int wallnumber, QGraphicsScene *canvas )
   : QGraphicsLineItem( 0, canvas ), SimItemBase( w, canvas){
 
+  /* wn == 1 -> C1; wn == 2 -> C2. This way we can tell which cell a wallitem belongs to. */
   wn = wallnumber;
 
   extern Parameter par;