diff --git a/admin-guide/operations/certificates.md b/admin-guide/operations/certificates.md
index 8601d887..6c3cdef9 100644
--- a/admin-guide/operations/certificates.md
+++ b/admin-guide/operations/certificates.md
@@ -9,6 +9,9 @@ First create a certificate signing request (CSR) like this, replacing `$FQDN`
 and `$ALIASES`
 
 ```
+ALTNAMES=xyz.psi.ch
+FQDN=xyz00.psi.ch
+
 cat >$FQDN.cnf <<EOF
 FQDN = $FQDN
 ORGNAME = Paul Scherrer Institut (PSI)