diff --git a/object.hpp b/object.hpp
index 2e6649f..1de83ed 100644
--- a/object.hpp
+++ b/object.hpp
@@ -49,6 +49,7 @@ namespace cruft::vk {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
     template <typename SelfT>
     struct root : public object<SelfT> {
         template <typename ...Args>
@@ -68,6 +69,7 @@ namespace cruft::vk {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
     /// a vulkan object that must be directly instantiated through
     /// constructor arguments, rather than being enumerated and owned by
     /// another object.
@@ -93,6 +95,7 @@ namespace cruft::vk {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
     /// a vulkan object that is obtained by listings from a parent object.
     template <typename SelfT>
     struct enumerated : public object<SelfT> {
@@ -103,6 +106,7 @@ namespace cruft::vk {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
     /// a vulkan object that is directly owned by a parent object.
     ///
     /// typically implies that this object must be freed using a reference to
@@ -149,6 +153,7 @@ namespace cruft::vk {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
     template <typename SelfT, typename OwnerT, typename ...Args>
     auto
     make_owned (OwnerT &owner, Args &&...args)