diff --git a/addons/account/account_invoice_view.xml b/addons/account/account_invoice_view.xml
index ed45c705674..6ec9d736fd0 100644
--- a/addons/account/account_invoice_view.xml
+++ b/addons/account/account_invoice_view.xml
@@ -203,7 +203,7 @@
                                 </field>
                             </group>
                             <group col="4" colspan="2">
-                                <button colspan="2" name="button_reset_taxes" states="draft" string="Compute Taxes" type="object" icon="terp-stock_format-scientific"/>
+                                <button colspan="2" name="button_reset_taxes" states="draft" string="Compute Taxes" type="object" icon="terp-stock_format-scientific" help="it will erase taxes"/>
                                 <field name="amount_untaxed"/>
                                 <label string="" colspan="2"/>
                                 <field name="amount_tax"/>
@@ -297,7 +297,7 @@
                                 </field>
                             </group>
                             <group col="4" colspan="2">
-                                <button colspan="2" name="button_reset_taxes" states="draft" string="Compute Taxes" type="object" groups="base.group_user" icon="terp-stock_format-scientific"/>
+                                <button colspan="2" name="button_reset_taxes" states="draft" string="Compute Taxes" type="object" groups="base.group_user" icon="terp-stock_format-scientific" help="it will erase taxes"/>
                                 <field name="amount_untaxed"/>
                                 <label string="" colspan="2"/>
                                 <field name="amount_tax"/>
diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 864e4dfc0a4..8cf725ec066 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -142,8 +142,8 @@ class crm_lead(crm_case, osv.osv):
         'categ_id': fields.many2one('crm.case.categ', 'Category', \
             domain="['|',('section_id','=',section_id),('section_id','=',False), ('object_id.model', '=', 'crm.lead')]"),
         'type_id': fields.many2one('crm.case.resource.type', 'Campaign', \
-            domain="['|',('section_id','=',section_id),('section_id','=',False)]"),
-        'channel_id': fields.many2one('res.partner.canal', 'Channel'),
+            domain="['|',('section_id','=',section_id),('section_id','=',False)]",help="From which Campaign (Seminar, Marketing Campaign, Mass mailing, ...) did this contact come from ?"),
+        'channel_id': fields.many2one('res.partner.canal', 'Channel',help="From which channel (mail, direct, phone, ...) did this contact reach you ?"),
 
         'contact_name': fields.char('Contact Name', size=64),
         'partner_name': fields.char("Customer Name", size=64,help='The name of the future partner that will be created while converting the into opportunity'),
diff --git a/addons/mrp/mrp_view.xml b/addons/mrp/mrp_view.xml
index 1ac11707870..8283ea0c910 100644
--- a/addons/mrp/mrp_view.xml
+++ b/addons/mrp/mrp_view.xml
@@ -1000,7 +1000,7 @@
             <field name="view_type">form</field>
             <field name="view_id" ref="mrp_workcenter_tree_view"/>
             <field name="search_view_id" ref="view_mrp_workcenter_search"/>
-            <field name="help">Work Centers allow you to create and manage manufacturing units consisting of one or more persons and/or machines that can be considered as a unit for capacity and planning forecasting.</field>
+            <field name="help">Work Centers allow you to create and manage manufacturing units.  They consist of workers and/or machines, which are  considered as units for capacity and planning forecast. Keep in mind that the working time and the resource leave are not taken into account  in the time computation of the work center.</field>
         </record>
 
         <menuitem id="menu_pm_resources_config" name="Resources" parent="menu_mrp_configuration"/>