diff --git a/include/XMLDocument/facturx.class.php b/include/XMLDocument/facturx.class.php
index 0f95548d0..0ebcda196 100644
--- a/include/XMLDocument/facturx.class.php
+++ b/include/XMLDocument/facturx.class.php
@@ -32,7 +32,12 @@ use horstoeko\zugferd\ZugferdProfiles;
 
 /**
  * @file
- * @brief answer to an inplace object
+ * @brief FacturX French / German Standard  for invoicing
+ */
+
+/**
+ * @class FacturX
+ * @brief FacturX French / German Standard for invoicing
  */
 class FacturX extends XMLInvoice
 {
diff --git a/include/XMLDocument/invoiceubl21.class.php b/include/XMLDocument/invoiceubl21.class.php
index 951d84d93..d1eae1ab5 100644
--- a/include/XMLDocument/invoiceubl21.class.php
+++ b/include/XMLDocument/invoiceubl21.class.php
@@ -359,7 +359,7 @@ class InvoiceUBL21 extends XMLInvoice {
 		</cac:Price>
 	</cac:InvoiceLine>     
      * @endcode
-     * @parameter $i (int) idx f $this->data->operation[$i]
+     * @param $i (int) idx f $this->data->operation[$i]
      *      
      */
     function build_invoiceLine($i)
@@ -403,7 +403,10 @@ class InvoiceUBL21 extends XMLInvoice {
     }
     /**
      * @brief Insert a PDF in the XML
-     * the document type is not due for BELGIUM
+     * the document type is not needed for BELGIUM
+     */
+    /**
+     * 
 @code      
  <cac:AdditionalDocumentReference>
     <cbc:ID>P01</cbc:ID>