diff --git a/hypergraph.md b/hypergraph.md
index ffa8fca60..867d2d9a4 100644
--- a/hypergraph.md
+++ b/hypergraph.md
@@ -1,9 +1,11 @@
 # Hypergraph
 
 - [[go]] https://en.wikipedia.org/wiki/Hypergraph
+- [[jonathan]] https://golem.ph.utexas.edu/category/2018/02/hypergraph_categories_of_cospa.html
 
 
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [go]: go "Go"
+[jonathan]: jonathan "Jonathan"
 [//end]: # "Autogenerated link references"
\ No newline at end of file