diff --git a/x.md b/x.md
index e5034210c..9a9829010 100644
--- a/x.md
+++ b/x.md
@@ -4,9 +4,13 @@
 - an [[unknown]].
 - a [[place]] in a [[map]].
   - a [[context]].
+  - a [[node]] in an [[agora]].
+  - https://twitter.com/flancian/status/1368247807665201159
 
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [place]: place "Place"
 [context]: context "Context"
+[node]: node "Node"
+[agora]: agora "Agora"
 [//end]: # "Autogenerated link references"
\ No newline at end of file