diff --git a/peter-singer.md b/peter-singer.md
index 854608c74..786094ad7 100644
--- a/peter-singer.md
+++ b/peter-singer.md
@@ -1,2 +1,8 @@
 # Peter Singer
-- [ ] Listen to https://twitter.com/lexfridman/status/1280876595092258817
+- [[Listen]] to https://twitter.com/lexfridman/status/1280876595092258817
+- My [[delegate]] in [[ethics]].
+  - I'm a fan of [[the expanding circle]].
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[the-expanding-circle]: the-expanding-circle "The Expanding Circle"
+[//end]: # "Autogenerated link references"
\ No newline at end of file