diff --git a/htdocs/accountancy/class/lettering.class.php b/htdocs/accountancy/class/lettering.class.php
index f6101f2ccf4..70d7a88c55b 100644
--- a/htdocs/accountancy/class/lettering.class.php
+++ b/htdocs/accountancy/class/lettering.class.php
@@ -31,9 +31,15 @@ include_once DOL_DOCUMENT_ROOT."/core/lib/date.lib.php";
 /**
  * Class lettering
  */
-class lettering extends BookKeeping {
-
-	public function LettrageTiers($socid){
+class lettering extends BookKeeping
+{
+    /**
+     * lettrageTiers
+     *
+     * @param   int   $socid      Thirdparty id
+     * @return  void
+     */
+	public function lettrageTiers($socid) {
 
 		$db = $this->db;