diff --git a/src/main/java/org/gcube/informationsystem/model/knowledge/TypeInformation.java b/src/main/java/org/gcube/informationsystem/model/knowledge/TypeInformation.java
index 64716ca..275586e 100644
--- a/src/main/java/org/gcube/informationsystem/model/knowledge/TypeInformation.java
+++ b/src/main/java/org/gcube/informationsystem/model/knowledge/TypeInformation.java
@@ -3,6 +3,9 @@ package org.gcube.informationsystem.model.knowledge;
 import org.gcube.informationsystem.base.reference.AccessType;
 import org.gcube.informationsystem.tree.NodeInformation;
 
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
 public interface TypeInformation<T> extends NodeInformation<T> {
 	
 	public AccessType getAccessType(T t);
diff --git a/src/main/java/org/gcube/informationsystem/tree/NodeInformation.java b/src/main/java/org/gcube/informationsystem/tree/NodeInformation.java
index ca1ba26..96b4fef 100644
--- a/src/main/java/org/gcube/informationsystem/tree/NodeInformation.java
+++ b/src/main/java/org/gcube/informationsystem/tree/NodeInformation.java
@@ -2,6 +2,9 @@ package org.gcube.informationsystem.tree;
 
 import java.util.Set;
 
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
 public interface NodeInformation<T> {
 
 	public String getIdentifier(T t);