diff --git a/source/glossary.rst b/source/glossary.rst
index 40c041f4c..9b25afbb3 100644
--- a/source/glossary.rst
+++ b/source/glossary.rst
@@ -119,6 +119,23 @@ Glossary
         extensions.
 
 
+    Implicit Namespace Package
+    Native Namespace Package
+
+        "Native namespace packages" and "implicit namespace packages" are two names for
+        the same type of namespace package. It's defined in :pep:`420`, and is available
+        in Python 3.3 and later.
+
+        The term "native" derives from the built-in feature of Python to create packages
+        without installing an extra package, such as setuptools, from outside the standard
+        library. The term "implicit" derives from the fact that you don't have to explicitly
+        declare the namespace package in a :file:`__init__.py` file.
+
+        This guide uses these names interchangeably.
+
+        ..  seealso::
+            :ref:`native-namespace-packages`
+
     Import Package
 
         A Python module which can contain other modules or recursively, other
diff --git a/source/guides/packaging-namespace-packages.rst b/source/guides/packaging-namespace-packages.rst
index 3d929d527..c59ddd6bb 100644
--- a/source/guides/packaging-namespace-packages.rst
+++ b/source/guides/packaging-namespace-packages.rst
@@ -71,6 +71,14 @@ from which the latter is discouraged:
 #. Use `legacy namespace packages`_. This comprises `pkgutil-style namespace packages`_
    and `pkg_resources-style namespace packages`_.
 
+.. note::
+
+    :term:`Native namespace packages <Native Namespace Package>` and
+    :term:`implicit namespace packages <Implicit Namespace Package>` are two
+    names for the same thing. This guide uses these names interchangeably.
+
+.. _native-namespace-packages:
+
 Native namespace packages
 -------------------------
 
@@ -159,8 +167,8 @@ Legacy namespace packages
 
 These two methods, that were used to create namespace packages prior to :pep:`420`,
 are now considered to be obsolete and should not be used unless you need compatibility
-with packages already using this method. Also, :doc:`pkg_resources <setuptools:pkg_resources>`
-has been deprecated.
+with packages already using this method. Also,
+:doc:`pkg_resources <setuptools:deprecated/pkg_resources>` has been deprecated.
 
 To migrate an existing package, all packages sharing the namespace must be migrated simultaneously.