diff --git a/addons/account/account_invoice_view.xml b/addons/account/account_invoice_view.xml
index be431c9b2e7..0f12001193d 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="This action 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="This action 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 98bc01a51af..294c5dfbf56 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -142,9 +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', 'Lead Source'),
-
+            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'),
         'optin': fields.boolean('Opt-In', help="If opt-in is checked, this contact has accepted to receive emails."),
diff --git a/addons/mrp/mrp_view.xml b/addons/mrp/mrp_view.xml
index 377b8d89c0e..fb029710eb3 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 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"/>