diff --git a/docs/source/_ext/plugin_markup.py b/docs/source/_ext/plugin_markup.py
index d8c1d635..94619ffe 100644
--- a/docs/source/_ext/plugin_markup.py
+++ b/docs/source/_ext/plugin_markup.py
@@ -80,7 +80,7 @@ class PluginMarkupDirective(SphinxDirective):
     The plugins file and its jsonschema are passed to the directive as parameters, i.e.,
     in Markdown:
 
-    .. code:: markdown
+    .. code-block:: markdown
 
        ```{plugin-markup} path/to/plugins.json path/to/plugins-schema.json
        ```