diff --git a/src/org.kde.knavalbattle.appdata.xml b/src/org.kde.knavalbattle.appdata.xml
--- a/src/org.kde.knavalbattle.appdata.xml
+++ b/src/org.kde.knavalbattle.appdata.xml
@@ -110,4 +110,7 @@
   <provides>
     <binary>knavalbattle</binary>
   </provides>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-cartoon">mild</content_attribute>
+  </content_rating>
 </component>