diff --git a/manifests/main/dirs.pp b/manifests/main/dirs.pp
index dfbd93c..d751001 100644
--- a/manifests/main/dirs.pp
+++ b/manifests/main/dirs.pp
@@ -19,7 +19,7 @@ class prometheus_cd::main::dirs (
       seluser  => system_u,
     }
     # data directory
-    file { $ps_data_dir,
+    file { $ps_data_dir:
       ensure   => directory,
       owner    => 'prometheus',
       group    => 'prometheus',
diff --git a/manifests/params.pp b/manifests/params.pp
index a41f820..9e54376 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -13,6 +13,7 @@
 # @param [String] ps_main_port the firewall main port for prometheus
 # @param [String] ps_auth_user the username for authentication
 # @param [String] ps_auth_pass the password for authentication
+# @param [String] ps_data_dir the data directory for prometheus
 ##############################################################################
 class prometheus_cd::params (