diff --git a/manifesto.md b/manifesto.md
index ccafda8..ff70bba 100644
--- a/manifesto.md
+++ b/manifesto.md
@@ -151,3 +151,15 @@ The data catalog is an essential component that enables cache-aware planning of
 ## Entity Relationships
 Note: Data services are missing below. They could be "libraries" for data, e.g. filling an organizational role for data dependencies at a larger scale.
 
+# Appendix
+
+## Is this some rotation of event sourcing?
+
+Event sourcing aspires to be honest about the different real data captured by and internal to the system. 
+
+# Describe event sourcing's worldview/tenets as relevant to databuild AI!
+
+## Why not data build services?
+
+Example use case: 
+