diff --git a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/CkanUtilsFactory.java b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/CkanUtilsFactory.java
index 2a947f7..8171f9b 100644
--- a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/CkanUtilsFactory.java
+++ b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/CkanUtilsFactory.java
@@ -16,6 +16,12 @@ public class CkanUtilsFactory {
 	private static CkanUtilsFactory instance = new CkanUtilsFactory();
 	private static ConcurrentHashMap<String, CacheBean> cache;
 	
+	/**
+	 * Private constructor for the hashmap's object values
+	 * @author Costantino Perciante at ISTI-CNR 
+	 * (costantino.perciante@isti.cnr.it)
+	 *
+	 */
 	private class CacheBean{
 		CKanUtilsImpl utils;
 		long ttl;
@@ -26,6 +32,9 @@ public class CkanUtilsFactory {
 		}
 	}
 	
+	/**
+	 * Private constructor
+	 */
 	private CkanUtilsFactory(){
 		
 		logger.debug("Ckan factory object build");
@@ -42,6 +51,12 @@ public class CkanUtilsFactory {
 		return instance;
 	} 
 	
+	/**
+	 * Retrieve the ckan utils information for the given scope
+	 * @param scope
+	 * @return
+	 * @throws Exception
+	 */
 	public CKanUtilsImpl getUtilsPerScope(String scope) throws Exception{
 		if(scope == null || scope.isEmpty())
 			throw new IllegalArgumentException("Invalid scope given!");
@@ -57,6 +72,11 @@ public class CkanUtilsFactory {
 		}
 	}
 
+	/**
+	 * Check if the ckan information must be retrieved again.
+	 * @param cacheBean
+	 * @return
+	 */
 	private boolean expired(CacheBean cacheBean) {
 		boolean expired = (cacheBean.ttl + MAX_LIFETIME <= System.currentTimeMillis());
 		logger.debug("expired is " + expired);