diff --git a/AlgebraicDataflowArchitectureModel/src/models/controlFlowModel/ControlFlowGraph.java b/AlgebraicDataflowArchitectureModel/src/models/controlFlowModel/ControlFlowGraph.java
index b349a4f..4837cd6 100644
--- a/AlgebraicDataflowArchitectureModel/src/models/controlFlowModel/ControlFlowGraph.java
+++ b/AlgebraicDataflowArchitectureModel/src/models/controlFlowModel/ControlFlowGraph.java
@@ -15,6 +15,12 @@
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * {@link ControlFlowGraph} is made from data-flow graph. <br>
+ * It manages two call graphs: push call graph and pull call graph.
+ *
+ * @implNote Some nodes are shared between push and pull call graphs.
+ */
 public class ControlFlowGraph extends DirectedGraph implements IFlowGraph {
 	private DataFlowGraph dataFlowGraph;
 	private CallGraph pushCallGraph;