diff --git a/htdocs/admin/modules.php b/htdocs/admin/modules.php
index d011b250730..bd6a238c0f0 100644
--- a/htdocs/admin/modules.php
+++ b/htdocs/admin/modules.php
@@ -1118,7 +1118,13 @@ if ($mode == 'deploy') {
 			}
 		}
 	} else {
-		$message = info_admin($langs->trans("InstallModuleFromWebHasBeenDisabledByFile", $dolibarrdataroot.'/installmodules.lock'));
+		if (getDolGlobalString('MAIN_MESSAGE_INSTALL_MODULES_DISABLED_CONTACT_US')) {
+			// Show clean message
+			$message = info_admin($langs->trans('InstallModuleFromWebHasBeenDisabledContactUs'));
+		} else {
+			// Show technical message
+			$message = info_admin($langs->trans("InstallModuleFromWebHasBeenDisabledByFile", $dolibarrdataroot.'/installmodules.lock'));
+		}
 		$allowfromweb = 0;
 	}
 
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 911bb6b0b93..8f9c4aa302f 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -1932,6 +1932,7 @@ BackupDumpWizard=Wizard to build the database dump file
 BackupZipWizard=Wizard to build the archive of documents directory
 SomethingMakeInstallFromWebNotPossible=Installation of external module is not possible from the web interface for the following reason:
 SomethingMakeInstallFromWebNotPossible2=For this reason, process to upgrade described here is a manual process only a privileged user may perform.
+InstallModuleFromWebHasBeenDisabledContactUs=Install of external modules from the application is currently locked. Please contact us if you need us to enable this feature.
 InstallModuleFromWebHasBeenDisabledByFile=Install of external module from application has been disabled by your administrator. You must ask him to remove the file <strong>%s</strong> to allow this feature.
 ConfFileMustContainCustom=Installing or building an external module from application need to save the module files into directory <strong>%s</strong>. To have this directory processed by Dolibarr, you must setup your <strong>conf/conf.php</strong> to add the 2 directive lines:<br><strong>$dolibarr_main_url_root_alt='/custom';</strong><br><strong>$dolibarr_main_document_root_alt='%s/custom';</strong>
 HighlightLinesOnMouseHover=Highlight table lines when mouse move passes over