diff --git a/htdocs/filefunc.inc.php b/htdocs/filefunc.inc.php
index 53a7fba96df..ebd5fd2e3ca 100644
--- a/htdocs/filefunc.inc.php
+++ b/htdocs/filefunc.inc.php
@@ -268,7 +268,7 @@ if (empty($dolibarr_strict_mode)) {
 define('DOL_DOCUMENT_ROOT', $dolibarr_main_document_root); // Filesystem core php (htdocs)
 
 if (!file_exists(DOL_DOCUMENT_ROOT."/core/lib/functions.lib.php")) {
-	print "Error: Dolibarr config file content seems to be not correctly defined.<br>\n";
+	print "Error: Dolibarr config file content seems to be not correctly defined (file ".DOL_DOCUMENT_ROOT."/core/lib/functions.lib.php not found).<br>\n";
 	print "Please run dolibarr setup by calling page <b>/install</b>.<br>\n";
 	exit(1);
 }