diff --git a/_toc.yml b/_toc.yml
index 14a6cea..9f16abc 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -18,6 +18,7 @@ parts:
     - file: notebooks/L1_uniform_time_sampling.ipynb
     - file: notebooks/L1_filtering_and_detrending.ipynb
     - file: notebooks/L1_figures_with_multiple_panels.ipynb
+    - file: notebooks/L1_surrogates.ipynb
     - file: notebooks/L1_working_with_age_ensembles.ipynb
   - caption: Data Analysis with Pyleoclim
     chapters: