diff --git a/README.md b/README.md
index f4f59de..ebe48a7 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,8 @@ PWA to view information on the individual nodes that make up the Tor network.
 
 Onionite is heavily inspired by [Atlas](https://gitweb.torproject.org/atlas.git) and [Globe](https://github.com/makepanic/globe).
 
+All information is provided by the [Onionoo](https://onionoo.torproject.org) API.
+
 "Tor" and the "Onion Logo" are registered trademarks of The Tor Project, Inc.
 
 ## License