diff --git a/doc/source/contribution-code.rst b/doc/source/contribution-code.rst
index 03bfeca0..ed266c98 100644
--- a/doc/source/contribution-code.rst
+++ b/doc/source/contribution-code.rst
@@ -12,11 +12,10 @@ build a conda environment.
 You don't need to build ``qutip`` in the editable mode unless you also want to contribute to `qutip`.
 Instead, you need to install ``qutip-qip`` by downloading the source code and run
 
-.. code-block::
+.. code-block:: bash
 
     pip install -e .
 
-
 Docstrings for the code
 =======================