diff --git a/htdocs/core/class/hookmanager.class.php b/htdocs/core/class/hookmanager.class.php
index cd33f1d8d02..439e31caae1 100644
--- a/htdocs/core/class/hookmanager.class.php
+++ b/htdocs/core/class/hookmanager.class.php
@@ -186,7 +186,8 @@ class HookManager
 				'sendMail',
 				'sendMailAfter',
 				'showLinkToObjectBlock',
-				'setContentSecurityPolicy'
+				'setContentSecurityPolicy',
+				'setHtmlTitle'
 				)
 			)) $hooktype='addreplace';
 
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 770d35d1ab3..826f83356c4 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1154,7 +1154,7 @@ function top_httphead($contenttype='text/html', $forcenocache=0)
  */
 function top_htmlhead($head, $title='', $disablejs=0, $disablehead=0, $arrayofjs='', $arrayofcss='', $disablejmobile=0, $disablenofollow=0)
 {
-	global $user, $conf, $langs, $db;
+	global $db, $conf, $langs, $user, $hookmanager;
 
 	top_httphead();
 
@@ -1188,9 +1188,22 @@ function top_htmlhead($head, $title='', $disablejs=0, $disablehead=0, $arrayofjs
 		$appli=constant('DOL_APPLICATION_TITLE');
 		if (!empty($conf->global->MAIN_APPLICATION_TITLE)) $appli=$conf->global->MAIN_APPLICATION_TITLE;
 
-		if ($title && ! empty($conf->global->MAIN_HTML_TITLE) && preg_match('/noapp/',$conf->global->MAIN_HTML_TITLE)) print '<title>'.dol_htmlentities($title).'</title>';
-		else if ($title) print '<title>'.dol_htmlentities($appli.' - '.$title).'</title>';
-		else print "<title>".dol_htmlentities($appli)."</title>";
+		print '<title>';
+		$titletoshow='';
+		if ($title && ! empty($conf->global->MAIN_HTML_TITLE) && preg_match('/noapp/',$conf->global->MAIN_HTML_TITLE)) $titletoshow = dol_htmlentities($title);
+		else if ($title) $titletoshow = dol_htmlentities($appli.' - '.$title);
+		else $titletoshow = dol_htmlentities($appli);
+
+		if (! is_object($hookmanager)) $hookmanager = new HookManager($db);
+		$hookmanager->initHooks("main");
+		$parameters=array('title'=>$titletoshow);
+		$result=$hookmanager->executeHooks('setHtmlTitle',$parameters);		// Note that $action and $object may have been modified by some hooks
+		if ($result > 0) $titletoshow = $hookmanager->resPrint;				// Replace Title to show
+		else $titletoshow .= $hookmanager->resPrint;						// Concat to Title to show
+
+		print $titletoshow;
+		print '</title>';
+
 		print "\n";
 
 		if (GETPOST('version','int')) $ext='version='.GETPOST('version','int');	// usefull to force no cache on css/js
@@ -1471,7 +1484,7 @@ function top_menu($head, $title='', $target='', $disablejs=0, $disablehead=0, $a
 	{
 		print "\n".'<!-- Start top horizontal -->'."\n";
 
-		print '<div class="side-nav-vert'.(GETPOST('dol_invisible_topmenu','int')?' hidden':'').'"><div id="id-top">';
+		print '<div class="side-nav-vert'.(GETPOST('dol_invisible_topmenu','int')?' hidden':'').'"><div id="id-top">';		// dol_invisible_topmenu differs from dol_hide_topmenu: dol_invisible_topmenu means we output menu but we make it invisible.
 
 		// Show menu entries
 		print '<div id="tmenu_tooltip'.(empty($conf->global->MAIN_MENU_INVERT)?'':'invert').'" class="tmenu">'."\n";