diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -2370,16 +2370,19 @@
 Demonstration of how to create and use customized managers and proxies:
 
 .. literalinclude:: ../includes/mp_newtype.py
+   :language: python
 
 
 Using :class:`Pool`:
 
 .. literalinclude:: ../includes/mp_pool.py
+   :language: python
 
 
 Synchronization types like locks, conditions and queues:
 
 .. literalinclude:: ../includes/mp_synchronize.py
+   :language: python
 
 
 An example showing how to use queues to feed tasks to a collection of worker