diff --git a/src/main/java/org/gcube/portlets/user/databasesmanager/client/toolbar/GxtToolbarFunctionality.java b/src/main/java/org/gcube/portlets/user/databasesmanager/client/toolbar/GxtToolbarFunctionality.java
index b3eaa79..8356ac0 100644
--- a/src/main/java/org/gcube/portlets/user/databasesmanager/client/toolbar/GxtToolbarFunctionality.java
+++ b/src/main/java/org/gcube/portlets/user/databasesmanager/client/toolbar/GxtToolbarFunctionality.java
@@ -75,6 +75,7 @@ public class GxtToolbarFunctionality {
 		// btnSubmitQuery.setIcon(Resources.ICONS.text());
 		btnTablesList.setScale(ButtonScale.SMALL);
 		btnTablesList.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnTablesList.setToolTip("returns the list of tables contained in the database schema");
 		toolBar.add(btnTablesList);
 
 		// Button for Submit Query
@@ -82,6 +83,7 @@ public class GxtToolbarFunctionality {
 		// btnSubmitQuery.setIcon(Resources.ICONS.text());
 		btnSubmitQuery.setScale(ButtonScale.SMALL);
 		btnSubmitQuery.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnSubmitQuery.setToolTip("allows to submit a query to the selected database");
 		toolBar.add(btnSubmitQuery);
 
 		// // Button to get information about a database
@@ -94,6 +96,7 @@ public class GxtToolbarFunctionality {
 		btnShowCreateTable = new Button(ConstantsPortlet.TABLEDETAILS);
 		btnShowCreateTable.setScale(ButtonScale.SMALL);
 		btnShowCreateTable.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnShowCreateTable.setToolTip("gets information about the selected table, e.g. create statement, number of rows, columns names");
 		toolBar.add(btnShowCreateTable);
 		toolBar.add(new SeparatorToolItem());
 
@@ -101,18 +104,21 @@ public class GxtToolbarFunctionality {
 		btnSimpleSample = new Button(ConstantsPortlet.SAMPLING);
 		btnSimpleSample.setScale(ButtonScale.SMALL);
 		btnSimpleSample.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnSimpleSample.setToolTip("retrieves the first 100 rows of the table");
 		toolBar.add(btnSimpleSample);
 
 		// Button for Smart Sample
 		btnSmartSample = new Button(ConstantsPortlet.SMARTSAMPLING);
 		btnSmartSample.setScale(ButtonScale.SMALL);
 		btnSmartSample.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnSmartSample.setToolTip("retrieves the first 100 rows of the table, maximising the number of non empty columns");
 		toolBar.add(btnSmartSample);
 
 		// button for Random Sample
 		btnRandomSample = new Button(ConstantsPortlet.RANDOMSAMPLING);
 		btnRandomSample.setScale(ButtonScale.SMALL);
 		btnRandomSample.setArrowAlign(ButtonArrowAlign.BOTTOM);
+		btnRandomSample.setToolTip("retrieves 100 randomly picked rows from the table");
 		toolBar.add(btnRandomSample);
 
 		// add(toolBar, new FlowData(10));