diff --git a/README.md b/README.md
index 28067a5..bf33547 100644
--- a/README.md
+++ b/README.md
@@ -21,4 +21,13 @@ You can run the `fetch.sh` script to generate all the files from scratch. Depend
 - https://github.com/ericchiang/pup
 - https://stedolan.github.io/jq/
 - https://www.gnu.org/software/parallel/
-- https://curl.se/
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+- https://curl.se/
+
+# Structure
+
+See https://www.basunivesh.com/how-your-dmat-mutual-funds-and-shares-isin-structured/
+
+# Alternative Sources
+
+- https://nsdl.co.in/downloadables/html/hold-mutual-fund-units.html
+- [The Kuvera Mutual Fund Details API](https://stoplight.captnemo.in/docs/kuvera/reference/Kuvera.yaml/paths/~1mf~1api~1v4~1fund_schemes~1%7Bcodes%7D.json/get) returns ISIN codes.
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