diff --git a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
index 25262f0..cdc4348 100644
--- a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
+++ b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
@@ -1917,7 +1917,7 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 						toAdd.setName(col.getStringValue());
 					else if (col.getName().compareTo("description") == 0)
 						toAdd.setDescription(col.getStringValue());
-					else if (col.getName().compareTo("ThumbnailURL") == 0)
+					else if (col.getName().compareTo("thumbnailURL") == 0)
 						toAdd.setThumbnailURL(col.getStringValue());
 					else if (col.getName().compareTo("mimeType") == 0)
 						toAdd.setMimeType(col.getStringValue());
diff --git a/src/main/java/org/gcube/portal/databook/shared/Attachment.java b/src/main/java/org/gcube/portal/databook/shared/Attachment.java
index 7222307..5b8e337 100644
--- a/src/main/java/org/gcube/portal/databook/shared/Attachment.java
+++ b/src/main/java/org/gcube/portal/databook/shared/Attachment.java
@@ -26,6 +26,7 @@ public class Attachment implements Serializable {
 	 * @param name the name of the attached file
 	 * @param description the description of the attached file
 	 * @param thumbnailURL the URL of the image representing the attached file
+	 * @param mimeType the type of file
 	 */
 	public Attachment(String id, String uri, String name, String description,
 			String thumbnailURL, String mimeType) {
diff --git a/src/main/java/org/gcube/portal/databook/shared/Feed.java b/src/main/java/org/gcube/portal/databook/shared/Feed.java
index 4efc3ed..3f6bba1 100644
--- a/src/main/java/org/gcube/portal/databook/shared/Feed.java
+++ b/src/main/java/org/gcube/portal/databook/shared/Feed.java
@@ -57,6 +57,7 @@ public class Feed implements Serializable, Comparable<Feed> {
 	 * @param thumbnailURL this is the user thumbnail url
 	 * @param linkTitle optional to be used when posting links
 	 * @param linkDescription optional to be used when posting links
+	 * @param linkHost option to be used when posting linkgs
 	  */
 	public Feed(String key, FeedType type, String entityId, Date time,
 			String vreid, String uri, String uriThumbnail, String description, PrivacyLevel privacy,