diff --git a/templates/MP2/Structs/WeaponVulnerability.xml b/templates/MP2/Structs/WeaponVulnerability.xml
index a7b64860..cb4e3516 100644
--- a/templates/MP2/Structs/WeaponVulnerability.xml
+++ b/templates/MP2/Structs/WeaponVulnerability.xml
@@ -6,6 +6,7 @@
             <Element Type="Float" ID="0x852D3871">
                 <Suffix>%</Suffix>
                 <DefaultValue>100.0</DefaultValue>
+                <CookPreference>OnlyIfModified</CookPreference>
             </Element>
             <Element Type="Choice" ID="0x68ACBD86">
                 <Values>
@@ -13,7 +14,9 @@
                     <Element Name="Reflect" ID="0x1"/>
                     <Element Name="PassThru" ID="0x2"/>
                     <Element Name="Immune" ID="0x3"/>
+                    <Element Name="Unknown (Rumble)" ID="0x4"/>
                 </Values>
+                <CookPreference>OnlyIfModified</CookPreference>
             </Element>
             <Element Type="Bool" ID="0x93677DA2">
                 <DefaultValue>false</DefaultValue>