doc/requirements.rst: add missing code directive

diff --git a/doc/requirements.rst b/doc/requirements.rst
index a3cb845..876765e 100644 (file)
--- a/doc/requirements.rst
+++ b/doc/requirements.rst
@@ -92,6 +92,8 @@ Build options
 Some additional options can be passed to the configure step. For the complete
 list of options, run:
 
+.. code:: bash
+
     $ ./waf configure --help
 
 Double precision