diff --git a/conf/postfix/sni b/conf/postfix/sni
index 29ed2e043e..b57b7e05ff 100644
--- a/conf/postfix/sni
+++ b/conf/postfix/sni
@@ -1,2 +1,4 @@
+# This maps domain to certificates to properly handle multi-domain context
+# (also we need a comment in this file such that it's never empty to prevent regenconf issues)
 {% for domain in domain_list.split() %}{{ domain }} /etc/yunohost/certs/{{ domain }}/key.pem /etc/yunohost/certs/{{ domain }}/crt.pem
-{% endfor %}
\ No newline at end of file
+{% endfor %}