diff --git a/docs/authentication.md b/docs/authentication.md
index 042b2ee2..3eec84bc 100644
--- a/docs/authentication.md
+++ b/docs/authentication.md
@@ -171,6 +171,6 @@ Now:
 
 This is **advanced**.
 
-You will find [background information here](spec/auth/token.md), [configuration information here](configuration.md#auth).
+You will find [background information here](./spec/auth/token.md), [configuration information here](configuration.md#auth).
 
 Beware that you will have to implement your own authentication service for this to work (though there exist third-party open-source implementations).