diff --git a/src/operation/type_prefixed.rs b/src/operation/type_prefixed.rs
index 6b7da60..cff032d 100644
--- a/src/operation/type_prefixed.rs
+++ b/src/operation/type_prefixed.rs
@@ -12,8 +12,8 @@ pub enum Typed {
     StrArr(super::SizePrefixedVec<i16, super::SizePrefixedString<i16>>),
     #[brw(magic = 98u8)]
     Byte(u8),
-    //#[brw(magic = 99u8)]
-    //Custom(T),
+    #[brw(magic = 99u8)]
+    Custom(super::SizePrefixedVec<i16, u8>),
     #[brw(magic = 100u8)]
     Double(f64),
     #[brw(magic = 101u8)]
@@ -54,6 +54,7 @@ impl Typed {
             Typed::Dict(_) => 68,
             Typed::StrArr(_) => 97,
             Typed::Byte(_) => 98,
+            Typed::Custom(_) => 99,
             Typed::Double(_) => 100,
             Typed::Event(_) => 101,
             Typed::Float(_) => 102,
@@ -80,6 +81,7 @@ impl Typed {
             68 => Self::Dict(<_>::read_be(reader)?),
             97 => Self::StrArr(<_>::read_be(reader)?),
             98 => Self::Byte(<_>::read_be(reader)?),
+            99 => Self::Custom(<_>::read_be(reader)?),
             100 => Self::Double(<_>::read_be(reader)?),
             101 => Self::Event(<_>::read_be(reader)?),
             102 => Self::Float(<_>::read_be(reader)?),
@@ -108,6 +110,7 @@ impl Typed {
             Typed::Dict(x) => x.write_be(writer)?,
             Typed::StrArr(x) => x.write_be(writer)?,
             Typed::Byte(x) => x.write_be(writer)?,
+            Typed::Custom(x) => x.vec.write_be(writer)?,
             Typed::Double(x) => x.write_be(writer)?,
             Typed::Event(x) => x.write_be(writer)?,
             Typed::Float(x) => x.write_be(writer)?,