diff --git a/Test.xml b/Test.xml
index 26ac17c..611d082 100644
--- a/Test.xml
+++ b/Test.xml
@@ -6,8 +6,8 @@
             <Pin>GPIO_2</Pin>
         </Port>
     </Device>
-    <Device name="PWM_example">
-        <Port protocol="PWM" frequency="2" buffer_size="1000">
+    <Device name="PWM_example" buffer_size="1000">
+        <Port protocol="PWM" frequency="2">
             <Pin>GPIO_10</Pin>
         </Port>
     </Device>
diff --git a/config.xsd b/config.xsd
index f93305d..66a3dda 100644
--- a/config.xsd
+++ b/config.xsd
@@ -95,6 +95,9 @@
             <xs:attribute name="name" 
                 type="xs:string" 
                 use="required"/>
+            <xs:attribute name="buffer_size" 
+                type="BufferSizeType"
+                use="optional"/>
         </xs:complexType>
     </xs:element>
 
@@ -108,7 +111,6 @@
             </xs:sequence>
             <xs:attribute name="protocol" type="ProtocolType" use="required"/>
             <xs:attribute name="frequency" type="FrequencyType" use="optional"/>
-            <xs:attribute name="buffer_size" type="BufferSizeType" use="optional"/>
         </xs:complexType>
     </xs:element>
 </xs:schema>
\ No newline at end of file