diff --git a/daily/2021-08-19.org b/daily/2021-08-19.org
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+:PROPERTIES:
+:ID:       cf52110e-7d33-4439-866f-c5fcf6ec5776
+:END:
+#+title: 2021-08-19
+* Mentoring Alex
+- Discussing the new list service design and the state interaction between
+  accounts and lists being treated as active based on their individual states.
+- Domain-driven design
+- Separating behavioural concerns
+- An entitlements / business logic service to handle logic involving multiple
+  business objects
+- Layers of abstraction separating rates of change
+- Comparing data model and api design to database normalization
diff --git a/iso_4217_simple_english_wikipedia_the_free_encyclopedia.org b/iso_4217_simple_english_wikipedia_the_free_encyclopedia.org
index e7fc25f..042b593 100644
--- a/iso_4217_simple_english_wikipedia_the_free_encyclopedia.org
+++ b/iso_4217_simple_english_wikipedia_the_free_encyclopedia.org
@@ -3,3 +3,6 @@
 :ROAM_REFS: https://simple.wikipedia.org/wiki/ISO_4217
 :END:
 #+title: ISO 4217: Currency Codes
+
+Defines different currencies using three-letter identifiers. Also tracks an
+exponent indicating the number of decimal places used in the currency.