diff --git a/doc/initialize.adoc b/doc/initialize.adoc
index 9f2c2c3..466e034 100644
--- a/doc/initialize.adoc
+++ b/doc/initialize.adoc
@@ -40,4 +40,5 @@ auto finalize() -> void;
 De-allocates the resources allocated by `initialize` for the `Policy`, including
 resources allocated by the facets in `Policy`. Resources are de-allocated in an
 arbitrary order. It is not necessary to call `finalize` between calls to
-`initialize`. It may be required to cooperate with memory leak detection tools.
+`initialize`. It is provided mainly for the benefit of memory leak detection
+schemes.
diff --git a/doc/overview.adoc b/doc/overview.adoc
index 6bddea5..f7bff48 100644
--- a/doc/overview.adoc
+++ b/doc/overview.adoc
@@ -24,31 +24,121 @@ the `include` directory to your project's include path.
 #### boost::openmethod
 
 The library's main namespace. Contains `method`, `virtual_ptr` and
-`virtual_ptr_traits`, `use_classes`, the `debug` and `release` policies, etc.
+`virtual_ptr_traits`, `use_classes`, the `default_policy`, etc.
 
 #### boost::openmethod::policies
 
-Contains the policy classes and their facets.
+Contains the policy framework.
 
 ### Headers
 
 #### <boost/openmethod/core.hpp>
 
-The library's main header. Contains `method`, `virtual_ptr` and
-`virtual_ptr_traits`, `use_classes`, the `debug` and `release` policies, etc.
+The library's main header. Provides `method`, `virtual_ptr` and
+`virtual_ptr_traits`, `use_classes`, the default policy, etc.
 
-#### <boost/openmethod/compiler.hpp>
-
-Defines `intialize` and `finalize`, which are used to register classes and
+If `BOOST_OPENMETHOD_DEFAULT_POLICY` is defined before including this header,
+its value is used as the default value for the `Policy` template parameter
+throughout the code. Otherwise, `boost::openmethod::default_policy` is used.
+Setting `BOOST_OPENMETHOD_DEFAULT_POLICY` after including the core header has no
+effect.
 
 #### <boost/openmethod/macros.hpp>
 
+Provides `BOOST_REGISTER_CLASSES`, `BOOST_OPENMETHOD`,
+`BOOST_OPENMETHOD_OVERRIDE` and other macros.
+
 #### <boost/openmethod.hpp>
 
-#### <boost/openmethod/policies.hpp>
+Convenience header. Includes `<boost/openmethod/core.hpp>` and
+`<boost/openmethod/macros.hpp>`.
+
+Also imports `boost::openmethod::virtual_ptr` in the global namespace. This is
+usually regarded as bad practice. The rationale is that OpenMethod emulates a
+language feature, and `virtual_ptr` is equivalent to keyword, similar to
+`virtual`. Besides, the macros are global as well.
+
+There are two ways to avoid importing `virtual_ptr` while still using the
+macros:
+
+* Define `BOOST_OPENMETHOD_NO_GLOBAL_VIRTUAL_PTR` before including
+  `<boost/openmethod.hpp>`. This disables the import of `virtual_ptr` in the
+  global namespace.
+
+* Include `<boost/openmethod/core.hpp>`and `<boost/openmethod/macros.hpp>`.
+
+#### <boost/openmethod/compiler.hpp>
+
+Provides `intialize` and `finalize`. Typically included only by the translation
+unit that contains `main`, unless dynamic loading is used in other places in the
+program.
 
 #### <boost/openmethod/shared_ptr.hpp>
 
+Provides support for using `std::shared_ptr` in place of plain pointers in
+virtual parameters.
+
 #### <boost/openmethod/unique_.hpp>
 
+Provides support for using `std::unique_ptr` in place of plain pointers in
+virtual parameters.
+
 #### <boost/openmethod/with_vptr.hpp>
+
+Provides support for storing v-table pointers directly in objects, in the same
+manner as native virtual functions.
+
+#### <boost/openmethod/policies.hpp>
+
+Provides the `debug` and `release` policies in the `boost::openmethod::policies`
+namespace, and `default_policy` in the `boost::openmethod` namespace, which is
+an alias to either `debug` or `release`, depending on the value of the
+preprocessor symbol `NDEBUG`.
+
+Usually not included directly. Can be used to create custom policies from stock
+policies, by forking them and adjusting a few facets.
+
+#### <boost/openmethod/policies/basic_policy.hpp>
+
+Provides the constructs used in the policy framework, essentially
+`basic_policy`, `facet`, and its abstract subclasses (`rtti`, `extern_vptr`,
+etc).
+
+#### <boost/openmethod/policies/std_rtti.hpp>
+
+Implements the `rtti` facet using standard RTTI.
+
+#### <boost/openmethod/policies/minimal_rtti.hpp>
+
+Implements the `rtti` facet using a minimal RTTI implementation. Can be used only with the "final" constructs, or with intrusive v-table pointers.
+
+#### <boost/openmethod/policies/vptr_vector.hpp>
+
+Implements the `extern_vptr` facet using a vector of pointers.
+
+#### <boost/openmethod/policies/vptr_map.hpp>
+
+Implements the `extern_vptr` facet using a map of pointers.
+
+#### <boost/openmethod/policies/fast_perfect_hash.hpp>
+
+Implements the `type_hash` facet using a perfect hash function.
+
+#### <boost/openmethod/policies/vectored_error_handler.hpp>
+
+Implements the `error_handler` facet by routing the error through a
+`std::function`.
+
+#### <boost/openmethod/policies/throw_error_handler.hpp>
+
+Implements the `error_handler` facet by throwing an exception.
+
+#### <boost/openmethod/policies/basic_error_output.hpp>
+
+Implements the `error_output` facet using a lightweight version of
+`std::ostream`.
+
+#### <boost/openmethod/policies/basic_trace_output.hpp>
+
+Implements the `trace_output` facet using a lightweight version of
+`std::ostream`.