diff --git a/roles/synapse/vardef.json b/roles/synapse/vardef.json
new file mode 100644
index 0000000..ebf6005
--- /dev/null
+++ b/roles/synapse/vardef.json
@@ -0,0 +1,125 @@
+{
+	"scheme": {
+		"type": "string",
+		"mandatory": false
+	},
+	"domain": {
+		"type": "string",
+		"mandatory": false
+	},
+	"database_kind": {
+		"type": "string",
+		"mandatory": false,
+		"options": [
+			"sqlite",
+			"postgresql"
+		]
+	},
+	"database_data_sqlite_path": {
+		"type": "string",
+		"mandatory": false
+	},
+	"database_data_postgresql_host": {
+		"type": "string",
+		"mandatory": false
+	},
+	"database_data_postgresql_port": {
+		"type": "integer",
+		"mandatory": false
+	},
+	"database_data_postgresql_username": {
+		"type": "string",
+		"mandatory": false
+	},
+	"database_data_postgresql_password": {
+		"type": "string",
+		"mandatory": true
+	},
+	"database_data_postgresql_schema": {
+		"type": "string",
+		"mandatory": false
+	},
+	"element_url": {
+		"type": "string",
+		"mandatory": false
+	},
+	"title": {
+		"type": "string",
+		"mandatory": false
+	},
+	"federation_enable": {
+		"type": "boolean",
+		"mandatory": false
+	},
+	"federation_whitelist": {
+		"type": "array",
+		"items": {
+			"type": "string"
+		},
+		"mandatory": false
+	},
+	"password_strict_policy": {
+		"type": "boolean",
+		"mandatory": false
+	},
+	"registration_shared_secret": {
+		"type": "string",
+		"mandatory": true
+	},
+	"authentication_kind": {
+		"type": "string",
+		"mandatory": false,
+		"options": [
+			"internal",
+			"authelia"
+		]
+	},
+	"authentication_data_authelia_provider_id": {
+		"type": "string",
+		"mandatory": false
+	},
+	"authentication_data_authelia_provider_name": {
+		"type": "string",
+		"mandatory": false
+	},
+	"authentication_data_authelia_client_id": {
+		"type": "string",
+		"mandatory": false
+	},
+	"authentication_data_authelia_client_secret": {
+		"type": "string",
+		"mandatory": false
+	},
+	"authentication_data_authelia_url_base": {
+		"type": "string",
+		"mandatory": false
+	},
+	"smtp_host": {
+		"type": "string",
+		"mandatory": false
+	},
+	"smtp_port": {
+		"type": "integer",
+		"mandatory": false
+	},
+	"smtp_username": {
+		"type": "string",
+		"mandatory": false
+	},
+	"smtp_password": {
+		"type": "string",
+		"mandatory": true
+	},
+	"admin_user_define": {
+		"type": "boolean",
+		"mandatory": false
+	},
+	"admin_user_name": {
+		"type": "string",
+		"mandatory": false
+	},
+	"admin_user_password": {
+		"type": "string",
+		"mandatory": false
+	}
+}