diff --git a/planet-hopf.md b/planet-hopf.md
index edba34e3a..eac1cec17 100644
--- a/planet-hopf.md
+++ b/planet-hopf.md
@@ -4,3 +4,5 @@
 - [[eric weinstein]]
   - with [[joe rogan]]
 
+https://twitter.com/O__C___D__/status/1380590675536797697
+