diff --git a/notes/did.md b/notes/did.md
index c0e27933..80695ec3 100644
--- a/notes/did.md
+++ b/notes/did.md
@@ -1,2 +1,3 @@
 - https://www.w3.org/TR/did-core/
 - https://en.wikipedia.org/wiki/Decentralized_identifier
+- https://en.wikipedia.org/wiki/Well-known_URI