diff --git a/lib/dnsbox-base/src/records/structs.rs b/lib/dnsbox-base/src/records/structs.rs
index c0e2c9d..15e6a59 100644
--- a/lib/dnsbox-base/src/records/structs.rs
+++ b/lib/dnsbox-base/src/records/structs.rs
@@ -299,7 +299,7 @@ pub struct DNAME {
 // pub struct OPT;
 
 // #[derive(Clone, PartialEq, Eq, Debug, DnsPacketData, DnsTextData, RRData)]
-// #[RRClass(?)]
+// #[RRClass(IN)]
 // pub struct APL;
 
 #[derive(Clone, PartialEq, Eq, Debug, DnsPacketData, DnsTextData, RRData)]