diff --git a/src/DocumentList.php b/src/DocumentList.php
index 60a7658..6aafba2 100644
--- a/src/DocumentList.php
+++ b/src/DocumentList.php
@@ -46,8 +46,15 @@ class DocumentList
      */
     public function items(): Generator
     {
+        $debug = defined('PDO_DOC_DEBUG_SQL');
+
         if ($this->result) {
-            while ($row = $this->result->fetch(PDO::FETCH_ASSOC)) yield $this->mapper->map($row);
+            while ($row = $this->result->fetch(PDO::FETCH_ASSOC)) {
+                if ($debug) echo "<pre>Returning an item\n</pre>";
+                yield $this->mapper->map($row);
+            }
+        } else {
+            if ($debug) echo 'Nothing to return';
         }
         $this->result = null;
         $this->pdo    = null;