diff --git a/resources/schema/inventory.xsd b/resources/schema/inventory.xsd
index 9e9bcec..207c6ea 100644
--- a/resources/schema/inventory.xsd
+++ b/resources/schema/inventory.xsd
@@ -186,6 +186,7 @@
           </xsd:simpleType>
         </xsd:attribute>
         <xsd:attribute name="sloleks" type="xsd:string"/>
+        <xsd:attribute name="kol" type="xsd:string"/>
       </xsd:extension>
     </xsd:simpleContent>
   </xsd:complexType>