diff --git a/src/Db/OdbcResultSet.php b/src/Db/OdbcResultSet.php
index 5530321..a622632 100644
--- a/src/Db/OdbcResultSet.php
+++ b/src/Db/OdbcResultSet.php
@@ -81,8 +81,9 @@ class OdbcResultSet implements \Iterator, \ArrayAccess, \Countable
     }
 
     // Iterator
-    /**
-     * @return bool|array
+     /**
+     * Return the current element
+     * @return mixed
      */
     public function current()
     {
@@ -90,32 +91,37 @@ class OdbcResultSet implements \Iterator, \ArrayAccess, \Countable
     }
 
     /**
-     * @return int
+     * Return the key of the current element
+     * @return mixed
      */
-    public function key()
+    public function key(): mixed
     {
         return $this->cursor_index;
     }
 
     /**
-     * @return array|bool
+     * Move forward to next element
+     * @return void
      */
-    public function next()
+    public function next(): void
     {
-        $current = $this->current();
         ++$this->cursor_index;
-        return $current;
     }
 
-    public function rewind()
+    /**
+     * Rewind the Iterator to the first element
+     * @return void
+     */
+    public function rewind(): void
     {
         $this->cursor_index = 0;
     }
 
     /**
+     * Checks if current position is valid
      * @return bool
      */
-    public function valid()
+    public function valid(): bool
     {
         return $this->offsetExists($this->cursor_index);
     }