diff --git a/environment.yml b/environment.yml
index 7f73ee7f..9b2c10e6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -7,6 +7,7 @@ dependencies:
   - pip
   - pip:
     - jupyter-book
+    - sphinxext-rediraffe
     - git+https://github.com/executablebooks/sphinx-multitoc-numbering
     - git+https://github.com/quantecon/quantecon-book-theme
     - git+https://github.com/executablebooks/sphinx-exercise.git
diff --git a/lectures/_config.yml b/lectures/_config.yml
index a6904a19..f19df2d1 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -12,7 +12,7 @@ html:
   baseurl: https://python.quantecon.org/
 
 sphinx:
-  extra_extensions: [sphinx_multitoc_numbering, sphinx_exercise]
+  extra_extensions: [sphinx_multitoc_numbering, sphinx_exercise, sphinxext.rediraffe]
   config:
     html_favicon: _static/lectures-favicon.ico
     html_theme: quantecon_book_theme
@@ -27,3 +27,5 @@ sphinx:
       description: This website presents a set of lectures on python programming for economics, designed and written by Thomas J. Sargent and John Stachurski.
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
       google_analytics_id: UA-54984338-9
+    rediraffe_redirects:
+      index_toc.md: intro.md