diff --git a/include/config_def.hpp b/include/config_def.hpp
index b92f9e6..445a1b2 100644
--- a/include/config_def.hpp
+++ b/include/config_def.hpp
@@ -106,12 +106,23 @@ STRUCT(HitSound,
 )
 STRUCT_STREAM_OPS(HitSound, normal, whistle, finish, clap)
 
+STRUCT(HitSample,
+    VAR_ENUM(, normalSet, SampleSet)
+    VAR_ENUM(, additionSet, SampleSet)
+    VAR_UINT(, index)
+    VAR_UINT(, volume)
+    VAR_STRING(, filename)
+)
+STRUCT_STREAM_OPS(HitSample, normalSet, additionSet, index, volume, filename)
+
 STRUCT(HitObject,
     VAR_INT(, x)
     VAR_INT(, y)
     VAR_INT(, time)
     VAR_STRUCT(, type, HitObjectType)
     VAR_STRUCT(, hitSound ,HitSound)
+    // TODO objectParams - possibly a union
+    VAR_STRUCT(, hitSample, HitSample)
 )
 STRUCT_STREAM_OPS(HitObject, x, y, time, type, hitSound)