diff --git a/REFERENCE.md b/REFERENCE.md
index cfcf742900438a0a4d75c145f4d5df54799e5ec0..7ceb4d079a838a987c5143e43ccff31a4d98fa4c 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -147,7 +147,8 @@ Default value: `'6.2.74'`
 
 Data type: `Stdlib::Fqdn`
 
-Primary mail domain name.
+Primary mail domain name. Web interface for Sympa mailing list manager, can
+be joined at https://$listdomain
 
 Default value: `'listes.example.org'`
 
@@ -155,7 +156,7 @@ Default value: `'listes.example.org'`
 
 Data type: `Stdlib::Email`
 
-Email addresses of listmasters
+Email addresses of listmaster
 
 Default value: `'listmaster@example.org'`
 
diff --git a/manifests/init.pp b/manifests/init.pp
index 6560edf157aae423d16a0cb55948ec189e6fb54b..609e182eae5990bc5591367b7406488e754d711d 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -14,8 +14,10 @@
 # @param sysconf_dir Configuration dir under prefix_path
 # @param aliases_file Aliases file to store Sympa mail aliases, under sysconfig_dir
 # @param release Installed release number of Sympa.
-# @param listdomain Primary mail domain name.
-# @param listmaster Email addresses of listmasters
+# @param listdomain
+#   Primary mail domain name. Web interface for Sympa mailing list manager, can
+#   be joined at https://$listdomain
+# @param listmaster Email addresses of listmaster
 # @param lang Supported language
 # @param topics Defines topics (categories) of the mailing lists.
 #
diff --git a/templates/sympa.conf.epp b/templates/sympa.conf.epp
index ee85d38a2de69bb01376fcb1a3e0147b217ab526..f45a1b1628f83e58471468ac51716effe3415450 100644
--- a/templates/sympa.conf.epp
+++ b/templates/sympa.conf.epp
@@ -33,7 +33,7 @@ db_passwd           <%= $sympa::db_password %>
 # each domain.
 
 #wwsympa_url         https://<%= $sympa::listdomain %>
-wwsympa_url         http://<%= $sympa::listdomain %>/sympa
+wwsympa_url         https://<%= $sympa::listdomain %>/sympa
 
 ########################################################################
 # Customizing Sympa