diff -r 01397c11ebb8 Doc/glossary.rst
--- a/Doc/glossary.rst	Thu Dec 03 01:36:03 2015 +0000
+++ b/Doc/glossary.rst	Thu Dec 03 17:08:10 2015 +0000
@@ -309,9 +309,13 @@
 
    finder
       An object that tries to find the :term:`loader` for a module. It must
-      implement either a method named :meth:`find_loader` or a method named
-      :meth:`find_module`. See :pep:`302` and :pep:`420` for details and
-      :class:`importlib.abc.Finder` for an :term:`abstract base class`.
+      implement at least one of the methods :meth:`find_spec`,
+      :meth:`find_loader` or :meth:`find_module`.
+
+      Since Python 3.3, there are two types of finder: :term:`meta path finders
+      <meta path finder>` and :term:`path entry finders <path entry finder>`.
+
+      See :pep:`302`, :pep:`420` and :pep:`451` for much more detail.
 
    floor division
       Mathematical division that rounds down to nearest integer.  The floor
@@ -593,10 +597,13 @@
       :class:`collections.OrderedDict` and :class:`collections.Counter`.
 
    meta path finder
-      A finder returned by a search of :data:`sys.meta_path`.  Meta path
+      A :term:`finder` returned by a search of :data:`sys.meta_path`.  Meta path
       finders are related to, but different from :term:`path entry finders
       <path entry finder>`.
 
+      See :class:`importlib.abc.MetaPathFinder` for the methods that meta path
+      finders implement.
+
    metaclass
       The class of a class.  Class definitions create a class name, a class
       dictionary, and a list of base classes.  The metaclass is responsible for
@@ -630,7 +637,7 @@
 
    module spec
       A namespace containing the import-related information used to load a
-      module.
+      module. An instance of :class:`importlib.machinery.ModuleSpec`.
 
    MRO
       See :term:`method resolution order`.
@@ -757,6 +764,9 @@
       (i.e. a :term:`path entry hook`) which knows how to locate modules given
       a :term:`path entry`.
 
+      See :class:`importlib.abc.PathEntryFinder` for the methods that path entry
+      finders implement.
+
    path entry hook
       A callable on the :data:`sys.path_hook` list which returns a :term:`path
       entry finder` if it knows how to find modules on a specific :term:`path
diff -r 01397c11ebb8 Doc/library/sys.rst
--- a/Doc/library/sys.rst	Thu Dec 03 01:36:03 2015 +0000
+++ b/Doc/library/sys.rst	Thu Dec 03 17:08:10 2015 +0000
@@ -779,18 +779,21 @@
 
 .. data:: meta_path
 
-    A list of :term:`finder` objects that have their :meth:`find_module`
+    A list of :term:`meta path finder` objects that have their :meth:`find_spec`
     methods called to see if one of the objects can find the module to be
-    imported. The :meth:`find_module` method is called at least with the
+    imported. The :meth:`find_spec` method is called with at least the
     absolute name of the module being imported. If the module to be imported is
-    contained in package then the parent package's :attr:`__path__` attribute
-    is passed in as a second argument. The method returns ``None`` if
-    the module cannot be found, else returns a :term:`loader`.
+    contained in a package, then the parent package's :attr:`__path__` attribute
+    is passed in as a second argument. The method returns a :term:`module spec`,
+    or ``None`` if the module cannot be found.
 
-    :data:`sys.meta_path` is searched before any implicit default finders or
-    :data:`sys.path`.
+    .. seealso::
 
-    See :pep:`302` for the original specification.
+        :class:`importlib.abc.MetaPathFinder`
+          The abstract base class defining the interface of finder objects on
+          :data:`meta_path`.
+        :class:`importlib.machinery.ModuleSpec`
+          The concrete class which :meth:`find_spec` should return instances of.
 
 
 .. data:: modules