diff --git a/lectures/_config.yml b/lectures/_config.yml
index bb8173d0..72af677f 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -79,6 +79,8 @@ sphinx:
     suppress_warnings: [mystnb.unknown_mime_type, myst.domains]
     # sphinx-proof
     proof_minimal_theme: true
+    # sphinx-exercise
+    exercise_style: "solution_follow_exercise"
     # -------------
     html_js_files:
       - https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.4/require.min.js