diff --git a/examples/README.md b/examples/README.md
index 5183b3d..3e7591d 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -1 +1,4 @@
 To run `Basic` example: copy `basic_in.urp.in` to `basic_in.urp` and fill in your GitHub application details.
+
+You can create an OAuth App in https://github.com/settings/developers, make sure to set
+*Authorization callback URL* to `http://localhost:8080/G/authorized/http.3A.2F.2Flocalhost.3A8080.2Fafter` in application settings.
diff --git a/src/ur/lib.urp b/src/ur/lib.urp
index 794f460..75b8097 100644
--- a/src/ur/lib.urp
+++ b/src/ur/lib.urp
@@ -6,6 +6,7 @@ effectful WorldFfi.post
 $/char
 $/string
 $/json
+$/monad
 urls
 oauth
 github