diff --git a/debian/README.Debian.plugins b/debian/README.Debian.plugins
index 9f2bff5..1e00f49 100644
--- a/debian/README.Debian.plugins
+++ b/debian/README.Debian.plugins
@@ -32,7 +32,7 @@ check_nginx_status:
     Required Packages: libwww-perl, monitoring-plugins-common | nagios-plugins-common
 
 check_openvpn:
-    Required Packages: python-argparse
+    Required Packages: libpython-stdlib
 
 check_phpfpm_status:
     Required Packages: libwww-perl, monitoring-plugins-common | nagios-plugins-common
@@ -49,6 +49,9 @@ check_sieve:
 check_smart:
     Required Packages: perl-modules, monitoring-plugins-common | nagios-plugins-common
 
+check_ssl_cert:
+    Required Packages: ca-certificates, expect, libtimedate-perl, openssl
+
 check_tftp:
     Required Packages: libnet-tftp-perl, monitoring-plugins-common | nagios-plugins-common