diff --git a/lectures/_config.yml b/lectures/_config.yml
index 6b99e06b..ad95918c 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -42,6 +42,8 @@ sphinx:
     # myst-nb config
     nb_render_image_options:
       width: 80%
+    nb_code_prompt_show: "Show {type}"
+    # -------------
     html_favicon: _static/lectures-favicon.ico
     html_theme: quantecon_book_theme
     html_static_path: ['_static']