diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index d5f89102d5853b..1e8acb0cb51c91 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -68,45 +68,48 @@ The following warnings category classes are currently defined:
 +----------------------------------+-----------------------------------------------+
 | Class                            | Description                                   |
 +==================================+===============================================+
-| :exc:`Warning`                   | This is the base class of all warning         |
-|                                  | category classes.  It is a subclass of        |
-|                                  | :exc:`Exception`.                             |
+| :exc:`Warning`                   | Base class for warning categories. It is a    |
+|                                  | subclass of :exc:`Exception`.                 |
 +----------------------------------+-----------------------------------------------+
-| :exc:`UserWarning`               | The default category for :func:`warn`.        |
+| :exc:`UserWarning`               | Base class for warnings generated by user     |
+|                                  | code. The default category for :func:`warn`.  |
 +----------------------------------+-----------------------------------------------+
-| :exc:`DeprecationWarning`        | Base category for warnings about deprecated   |
+| :exc:`DeprecationWarning`        | Base class for warnings about deprecated      |
 |                                  | features when those warnings are intended for |
 |                                  | other Python developers (ignored by default,  |
 |                                  | unless triggered by code in ``__main__``).    |
 +----------------------------------+-----------------------------------------------+
-| :exc:`SyntaxWarning`             | Base category for warnings about dubious      |
-|                                  | syntactic features (typically emitted when    |
-|                                  | compiling Python source code, and hence       |
-|                                  | may not be suppressed by runtime filters)     |
+| :exc:`PendingDeprecationWarning` | Base class for warnings about features        |
+|                                  | that will be deprecated in the future         |
+|                                  | (ignored by default).                         |
 +----------------------------------+-----------------------------------------------+
-| :exc:`RuntimeWarning`            | Base category for warnings about dubious      |
-|                                  | runtime features.                             |
+| :exc:`SyntaxWarning`             | Base class for warnings about dubious syntax  |
+|                                  | (typically emitted when compiling Python      |
+|                                  | source code, and hence may not be suppressed  |
+|                                  | by runtime filters).                          |
 +----------------------------------+-----------------------------------------------+
-| :exc:`FutureWarning`             | Base category for warnings about deprecated   |
+| :exc:`RuntimeWarning`            | Base class for warnings about dubious runtime |
+|                                  | behavior.                                     |
++----------------------------------+-----------------------------------------------+
+| :exc:`FutureWarning`             | Base class for warnings about deprecated      |
 |                                  | features when those warnings are intended for |
 |                                  | end users of applications that are written in |
 |                                  | Python.                                       |
 +----------------------------------+-----------------------------------------------+
-| :exc:`PendingDeprecationWarning` | Base category for warnings about features     |
-|                                  | that will be deprecated in the future         |
-|                                  | (ignored by default).                         |
-+----------------------------------+-----------------------------------------------+
-| :exc:`ImportWarning`             | Base category for warnings triggered during   |
+| :exc:`ImportWarning`             | Base class for warnings triggered during      |
 |                                  | the process of importing a module (ignored by |
 |                                  | default).                                     |
 +----------------------------------+-----------------------------------------------+
-| :exc:`UnicodeWarning`            | Base category for warnings related to         |
+| :exc:`UnicodeWarning`            | Base class for warnings related to            |
 |                                  | Unicode.                                      |
 +----------------------------------+-----------------------------------------------+
-| :exc:`BytesWarning`              | Base category for warnings related to         |
+| :exc:`EncodingWarning`           | Base class for warnings related to encodings. |
+|                                  | See :ref:`io-encoding-warning` for details.   |
++----------------------------------+-----------------------------------------------+
+| :exc:`BytesWarning`              | Base class for warnings related to            |
 |                                  | :class:`bytes` and :class:`bytearray`.        |
 +----------------------------------+-----------------------------------------------+
-| :exc:`ResourceWarning`           | Base category for warnings related to         |
+| :exc:`ResourceWarning`           | Base class for warnings related to            |
 |                                  | resource usage (ignored by default).          |
 +----------------------------------+-----------------------------------------------+