diff --git a/docs/_toc.yml b/docs/_toc.yml
index 9761192..5a18f79 100644
--- a/docs/_toc.yml
+++ b/docs/_toc.yml
@@ -10,4 +10,5 @@ chapters:
       - file: walkthrough/one-dim
       - file: walkthrough/two-dim
       - file: walkthrough/encoding
+      - file: walkthrough/sparse
   - file: api