diff --git a/src/Cart.php b/src/Cart.php
index 1d26cb3..70d7b66 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -184,6 +184,24 @@ public function getPromotions()
         return $this->_promotions;
     }
 
+    /**
+     * Set total rounding function.
+     *
+     * @param callable|null $rounding
+     */
+    public function setTotalRounding(?callable $rounding): void
+    {
+        $this->totalRounding = $rounding;
+    }
+
+    /**
+     * Get total rounding function.
+     */
+    public function getTotalRounding(): ?callable
+    {
+        return $this->totalRounding;
+    }
+
     /**
      * Set sorting by type.
      *