diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst
index 57ed291..2509380 100644
--- a/Doc/library/exceptions.rst
+++ b/Doc/library/exceptions.rst
@@ -694,6 +694,14 @@
    Base class for warnings about features which will be deprecated in the
    future.
 
+   .. note::
+      PendingDeprecationWarning was introduced as an "ignored by default"
+      version of DeprecationWarning.  But :exc:`DeprecationWarning` is also
+      ignored by default since Python 2.7 and 3.2.
+      There is not much difference between PendingDeprecationWarning and
+      DeprecationWarning nowadays.  DeprecationWarning is recommended
+      in general.
+
 
 .. exception:: SyntaxWarning
 
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index b04bd79..d121f32 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -109,11 +109,11 @@
 +----------------------------------+-----------------------------------------------+
 
 .. versionchanged:: 3.7
-  Previously :exc:`DeprecationWarning` and :exc:`FutureWarning` were
-  distinguished based on whether a feature was being removed entirely or
-  changing its behaviour. They are now distinguished based on their
-  intended audience and the way they're handled by the default warnings
-  filters.
+   Previously :exc:`DeprecationWarning` and :exc:`FutureWarning` were
+   distinguished based on whether a feature was being removed entirely or
+   changing its behaviour. They are now distinguished based on their
+   intended audience and the way they're handled by the default warnings
+   filters.
 
 
 .. _warning-filter: