diff --git a/Authentication.md b/Authentication.md
index 2439853..0f21f4d 100644
--- a/Authentication.md
+++ b/Authentication.md
@@ -5,6 +5,7 @@ It is recommended to use a library to facilitate the authentication.
 To get the openid configuration call the following url: https://accounts.farmmaps.awtest.nl/.well-known/openid-configuration 
 
 The user could also use the openid-configuration to handle authentication by themselves.  
+https://identitymodel.readthedocs.io/en/latest/native/overview.html
 
 The token received needs to be used in the request header.
 >'Authorization': 'bearer {token}'