diff --git a/README.md b/README.md
index b720b8f..577f0a6 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,7 @@ $ docker compose up -d
 
 ## pds
 
+- https://atproto.com/ja/guides/lexicon
 - https://at.syu.is/at/did:plc:uqzpqmrjnptsxezjx4xuh2mn/ai.syui.card/3lagpwihqxi2v
 
 ```sh