diff --git a/INSTALL/patch_smime.sql b/INSTALL/patch_smime.sql
new file mode 100644
index 000000000..618e09dc4
--- /dev/null
+++ b/INSTALL/patch_smime.sql
@@ -0,0 +1,3 @@
+-- Patch to add column in users table in order to save x509 certificate
+
+ALTER TABLE `users` ADD `certif_public` longtext COLLATE utf8_bin NOT NULL AFTER `gpgkey`;