diff --git a/AlgebraicDataflowArchitectureModel/src/algorithms/SelectableDataTransfers.java b/AlgebraicDataflowArchitectureModel/src/algorithms/SelectableDataTransfers.java
index cc1594b..c59e4f2 100644
--- a/AlgebraicDataflowArchitectureModel/src/algorithms/SelectableDataTransfers.java
+++ b/AlgebraicDataflowArchitectureModel/src/algorithms/SelectableDataTransfers.java
@@ -9,12 +9,14 @@
 public class SelectableDataTransfers {
 	static public ResourceDependencyGraph init(ResourceDependencyGraph graph) {
 		List<Node> nodes = new ArrayList<>(graph.getNodes());
+		// set push only attributes
 		for (Node n: graph.getNodes()) {
 			if (nodes.contains(n) && ((StoreAttribute) ((ResourceNode) n).getAttribute()).isNeeded()) {
 				nodes.remove(n);
 				trackEdges(n, nodes);
 			}
 		}
+		// set push/pull attributes to the remaining edges
 		for (Edge e : graph.getEdges()) {
 			if (((ResourceDependency) e).getAttribute() == null) {
 				PushPullAttribute ppat = new PushPullAttribute();
@@ -28,6 +30,7 @@
 	}
 
 	static private void trackEdges(Node n, List<Node> nodes) {
+		// recursively set push only attributes to input side edges
 		for (Edge e : ((ResourceNode) n).getInEdges()) {
 			PushPullAttribute ppat = new PushPullAttribute();
 			ppat.addOption(PushPullValue.PUSH);