diff --git a/personio-auth-api.yaml b/personio-auth-api.yaml
index 8239a55..74a89c1 100644
--- a/personio-auth-api.yaml
+++ b/personio-auth-api.yaml
@@ -91,5 +91,7 @@ components:
                   type: string
                 expires_in:
                   type: number
+                  description: Expiration time in seconds.
                 scope:
-                  type: string
\ No newline at end of file
+                  type: string
+                  description: The scope(s) this authentication token has access to; space-separated