diff --git a/category.md b/category.md
new file mode 100644
index 000000000..96396737b
--- /dev/null
+++ b/category.md
@@ -0,0 +1,5 @@
+# category
+
+- [[wp]] https://en.wikipedia.org/wiki/Category_(mathematics)
+  - [[go]] [[wp]]
+
diff --git a/journal/2021-09-12.md b/journal/2021-09-12.md
index c8d8b03f6..ff3e868a0 100644
--- a/journal/2021-09-12.md
+++ b/journal/2021-09-12.md
@@ -10,4 +10,5 @@
 - [[push]] [[agora protocol]]
   - [[wikilinks]]
   - [[tweet]] https://twitter.com/flancian/status/1437079533253976066
-  - [[projection]]
\ No newline at end of file
+  - [[projection]]
+  - [[category]]
\ No newline at end of file
diff --git a/moloch.md b/moloch.md
index a10343b8c..ffc933582 100644
--- a/moloch.md
+++ b/moloch.md
@@ -2,6 +2,8 @@
 
 - an [[egregore]]
   - [[pull]] [[meditations on moloch]]
+  - [[wp]] https://en.wikipedia.org/wiki/Moloch
+    - [[]]
   - An unnecessary vector against [[protopoi]], often taking the form of [[unsolved]] [[coordination problems]].
   - The social evil of missed opportunities and local optima.
   - [[some days I feel like slaying moloch]]