diff --git a/manifests/api.pp b/manifests/api.pp
index 72c1d81..efeb574 100644
--- a/manifests/api.pp
+++ b/manifests/api.pp
@@ -25,16 +25,16 @@
 #  Defaults to $facts['os_service_default'].
 #
 # [*workers*]
-#  (Optional) Number of workers for Murano Api
-#  Defaults to $facts['os_workers']
+#  (optional) number of workers for Murano Api
+#  defaults to $facts['os_workers']
 #
 class murano::api(
-  $manage_service = true,
-  $enabled        = true,
-  $package_ensure = 'present',
-  $host           = $facts['os_service_default'],
-  $port           = $facts['os_service_default'],
-  $workers        = $facts['os_workers'],
+  Boolean $manage_service = true,
+  Boolean $enabled        = true,
+  $package_ensure         = 'present',
+  $host                   = $facts['os_service_default'],
+  $port                   = $facts['os_service_default'],
+  $workers                = $facts['os_workers'],
 ) {
 
   include murano::deps
diff --git a/manifests/cfapi.pp b/manifests/cfapi.pp
index 1b6dbd5..32b3058 100644
--- a/manifests/cfapi.pp
+++ b/manifests/cfapi.pp
@@ -43,15 +43,15 @@
 #  Defaults to $facts['os_service_default'].
 #
 class murano::cfapi(
-  $tenant              = 'admin',
-  $manage_service      = true,
-  $enabled             = true,
-  $package_ensure      = 'present',
-  $bind_host           = $facts['os_service_default'],
-  $bind_port           = $facts['os_service_default'],
-  $auth_url            = 'http://127.0.0.1:5000',
-  $user_domain_name    = $facts['os_service_default'],
-  $project_domain_name = $facts['os_service_default'],
+  $tenant                 = 'admin',
+  Boolean $manage_service = true,
+  Boolean $enabled        = true,
+  $package_ensure         = 'present',
+  $bind_host              = $facts['os_service_default'],
+  $bind_port              = $facts['os_service_default'],
+  $auth_url               = 'http://127.0.0.1:5000',
+  $user_domain_name       = $facts['os_service_default'],
+  $project_domain_name    = $facts['os_service_default'],
 ) {
 
   include murano::deps
diff --git a/manifests/dashboard.pp b/manifests/dashboard.pp
index 06fa40b..a9d1370 100644
--- a/manifests/dashboard.pp
+++ b/manifests/dashboard.pp
@@ -57,14 +57,14 @@ class murano::dashboard(
   $package_ensure          = 'present',
   $dashboard_name          = undef,
   $repo_url                = undef,
-  $enable_glare            = false,
+  Boolean $enable_glare    = false,
   $collect_static_script   = '/usr/share/openstack-dashboard/manage.py',
   $metadata_dir            = '/var/cache/murano-dashboard',
   $max_file_size           = '5',
   $dashboard_debug_level   = 'DEBUG',
   $client_debug_level      = 'ERROR',
   $log_handler             = 'file',
-  $sync_db                 = true,
+  Boolean $sync_db         = true,
   $image_filter_project_id = undef,
 ) {
 
diff --git a/manifests/engine.pp b/manifests/engine.pp
index 22b1c74..2849374 100644
--- a/manifests/engine.pp
+++ b/manifests/engine.pp
@@ -21,10 +21,10 @@
 #  Defaults to $facts['os_workers']
 #
 class murano::engine(
-  $manage_service = true,
-  $enabled        = true,
-  $package_ensure = 'present',
-  $workers        = $facts['os_workers'],
+  Boolean $manage_service = true,
+  Boolean $enabled        = true,
+  $package_ensure         = 'present',
+  $workers                = $facts['os_workers'],
 ) {
 
   include murano::deps
diff --git a/manifests/init.pp b/manifests/init.pp
index c4189d1..d068ae2 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -235,11 +235,11 @@ class murano(
   $service_url                = undef,
   $service_host               = '127.0.0.1',
   $service_port               = '8082',
-  $use_ssl                    = false,
+  Boolean $use_ssl            = false,
   $cert_file                  = $facts['os_service_default'],
   $key_file                   = $facts['os_service_default'],
   $ca_file                    = $facts['os_service_default'],
-  $use_neutron                = true,
+  Boolean $use_neutron        = true,
   $external_network           = $::murano::params::default_external_network,
   $default_router             = $facts['os_service_default'],
   $default_nameservers        = $facts['os_service_default'],
@@ -251,7 +251,7 @@ class murano(
   $database_max_retries       = undef,
   $database_retry_interval    = undef,
   $database_max_overflow      = undef,
-  $sync_db                    = true,
+  Boolean $sync_db            = true,
   Boolean $purge_config       = false,
   $amqp_durable_queues        = $facts['os_service_default'],
 ) inherits murano::params {