diff --git a/htdocs/admin/company_socialnetworks.php b/htdocs/admin/company_socialnetworks.php
index 20d86f4aa59..e9171431187 100644
--- a/htdocs/admin/company_socialnetworks.php
+++ b/htdocs/admin/company_socialnetworks.php
@@ -94,6 +94,7 @@ $head = company_admin_prepare_head();
 print dol_get_fiche_head($head, 'socialnetworks', '', -1, '');
 
 print '<span class="opacitymedium">'.$langs->trans("CompanyFundationDesc", $langs->transnoentities("Save"))."</span><br>\n";
+print '<span class="opacitymedium">'.$langs->trans("MoreNetworksAvailableWithModule")."</span><br>\n";
 print "<br>\n";
 
 
diff --git a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
index e40204ea497..7ee97826b87 100644
--- a/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
+++ b/htdocs/install/mysql/migration/16.0.0-17.0.0.sql
@@ -386,3 +386,6 @@ ALTER TABLE llx_user ADD COLUMN birth_place varchar(64);
 
 ALTER TABLE llx_opensurvey_user_studs ADD COLUMN date_creation datetime NULL;
 ALTER TABLE llx_opensurvey_comments ADD COLUMN date_creation datetime NULL;
+
+ALTER TABLE llx_c_tva ADD COLUMN use_default tinyint DEFAULT 0;
+
diff --git a/htdocs/install/mysql/tables/llx_c_tva.sql b/htdocs/install/mysql/tables/llx_c_tva.sql
index b9a6cc4e12c..9bc77bb69ea 100644
--- a/htdocs/install/mysql/tables/llx_c_tva.sql
+++ b/htdocs/install/mysql/tables/llx_c_tva.sql
@@ -28,6 +28,7 @@ create table llx_c_tva
   localtax1_type	varchar(10)	 NOT NULL DEFAULT '0',
   localtax2         varchar(20)  NOT NULL DEFAULT '0',
   localtax2_type	varchar(10)  NOT NULL DEFAULT '0',
+  use_default	    tinyint DEFAULT 0,								-- set to 1 to be the default vat when no vat defined on product
   recuperableonly   integer NOT NULL DEFAULT 0,
   note              varchar(128),
   active            tinyint DEFAULT 1 NOT NULL,
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index b6c780a6be0..538309a6342 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -1250,6 +1250,7 @@ AreaForAdminOnly=Setup parameters can be set by <b>administrator users</b> only.
 SystemInfoDesc=System information is miscellaneous technical information you get in read only mode and visible for administrators only.
 SystemAreaForAdminOnly=This area is available to administrator users only. Dolibarr user permissions cannot change this restriction.
 CompanyFundationDesc=Edit the information of your company/organization. Click on "%s" button at the bottom of the page when done.
+MoreNetworksAvailableWithModule=More social networks may be available by enabling the module "Social networks".
 AccountantDesc=If you have an external accountant/bookkeeper, you can edit here its information.
 AccountantFileNumber=Accountant code
 DisplayDesc=Parameters affecting the look and presentation of the application can be modified here.