diff --git a/doc/src/Python_launch.rst b/doc/src/Python_launch.rst
index 02963c945e..500a107977 100644
--- a/doc/src/Python_launch.rst
+++ b/doc/src/Python_launch.rst
@@ -56,7 +56,7 @@ and you should see the same output as if you had typed
 
 Note that without the mpi4py specific lines from ``test.py``
 
-.. code-block::
+.. code-block:: Python
 
    from lammps import lammps
    lmp = lammps()