diff --git a/src/Model/ChannelPricingInterface.php b/src/Model/ChannelPricingInterface.php
index cb7178c..7457420 100644
--- a/src/Model/ChannelPricingInterface.php
+++ b/src/Model/ChannelPricingInterface.php
@@ -40,5 +40,5 @@ public function resetBulkIdentifier(): void;
 
     public function getUsedPromotions(): array;
 
-    public function addUsedPromotions(string $promotionCode): void;
+    public function addUsedPromotion(string $promotionCode): void;
 }
diff --git a/src/Model/ChannelPricingTrait.php b/src/Model/ChannelPricingTrait.php
index 68794ed..27bad6a 100644
--- a/src/Model/ChannelPricingTrait.php
+++ b/src/Model/ChannelPricingTrait.php
@@ -133,7 +133,7 @@ public function getUsedPromotions(): array
         return $this->usedPromotions;
     }
 
-    public function setUsedPromotions(array $usedPromotions): void
+    public function addUsedPromotion(array $usedPromotions): void
     {
         $this->usedPromotions = $usedPromotions;
     }