diff --git a/delaunay triangulation.md b/delaunay triangulation.md
new file mode 100644
index 000000000..0a3f84cdc
--- /dev/null
+++ b/delaunay triangulation.md	
@@ -0,0 +1,5 @@
+# delaunay triangulation
+
+- https://en.wikipedia.org/wiki/Delaunay_triangulation
+- https://twitter.com/Fish_CTO/status/1427003576790896645
+
diff --git a/journal/2021-08-15.md b/journal/2021-08-15.md
index f96e3a902..e031d3845 100644
--- a/journal/2021-08-15.md
+++ b/journal/2021-08-15.md
@@ -16,4 +16,7 @@
 - [[sunday]]
 - [[read]]
   - [[i am not a straussian]]
-- [[robert delaunay]]
\ No newline at end of file
+- [[delaunay]]
+  - [[robert delaunay]]
+  - [[boris delaunay]]
+    - [[delaunay triangulation]]
\ No newline at end of file