diff --git a/62.md b/62.md
index 47a80d6..bdbdfe6 100644
--- a/62.md
+++ b/62.md
@@ -27,7 +27,8 @@ A publication index defines the structure and metadata of a collection. It serve
   - `d` tag
   - `pubkey`
   - `kind`
-- MUST include `e` tags listing the events in desired display order
+- MUST include `a` tags or `e` tags, listing the events in desired display order.
+  - `a` tags automatically will update with edits, while`e` tags will lock entry to a specific version. See [standardized tags](https://github.com/limina1/nips/tree/master?tab=readme-ov-file#standardized-tags)
   - Referenced events SHOULD be kind 30041 sections or nested kind 30040 indices
   - Additional event kinds MAY be supported
 - For derivative works: