diff --git a/admin_manual/installation/source_installation.rst b/admin_manual/installation/source_installation.rst
index 446a99954..4f77d529d 100644
--- a/admin_manual/installation/source_installation.rst
+++ b/admin_manual/installation/source_installation.rst
@@ -258,8 +258,8 @@ the default site. Open a terminal and run::
           plan to make your Nextcloud server publicly accessible. You might
           want to consider getting a certificate signed by a commercial signing
           authority. Check with your domain name registrar or hosting service
-          for good deals on commercial certificates.
-
+          for good deals on commercial certificates. Or use free `Let's Encrypt <https://letsencrypt.org/>`_ one.
+ 
 .. _installation_wizard_label:
 
 Installation wizard