diff --git a/defcon.md b/defcon.md
index 20b37f811..a4b7682c2 100644
--- a/defcon.md
+++ b/defcon.md
@@ -3,6 +3,8 @@
 - A [[conference]].
   - [[go]] https://defcon.org
   - [[pull]] https://en.wikipedia.org/wiki/DEF_CON
+  - [[2021]]
+    - [[guardian]] https://www.theguardian.com/technology/2021/aug/04/why-hacker-summer-camp-and-pandemic-precautions-dont-mix
 - A [[station]].
   - on [[soma.fm]].
   - [[pull]] [[defcon radio]]