diff --git a/notsof.md b/notsof.md
index c0a0f4da7..889d9c7fa 100644
--- a/notsof.md
+++ b/notsof.md
@@ -46,6 +46,8 @@
   - [[competition]] -> [[market dynamics]] -> [[specialization]] and development of [[individuality]]
 - local [[mutations]], [[reputation]]
   - parallels with the development of [[authorship]] in art?
+- [[p62]] category trees
+  - We invent theories to alleviate the burden of freedom from tradition.
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [read]: read "Read"