diff --git a/src/building.js b/src/building.js
index 8b20040..0d61cb4 100644
--- a/src/building.js
+++ b/src/building.js
@@ -48,6 +48,9 @@ class Building {
 
   /**
    * build an object
+   *
+   * @param {string} id - the unique XML id of the object.
+   * @param {string} FullXmlData - XML data.
    */
   constructor(id, FullXmlData) {
     this.id = id;