Add link to graph doc in the tutorial

5621b267 · Francesco Visin · 1aa76646 · 5621b267
--- a/doc/tutorial/index.txt
+++ b/doc/tutorial/index.txt
@@ -66,6 +66,7 @@ Further readings

 .. toctree::

+    ../extending/graphstructures 
    loading_and_saving
    gpu_data_convert
    aliasing