diff --git a/frontend/coprs_frontend/coprs/auth.py b/frontend/coprs_frontend/coprs/auth.py
index ecec9a3cb..0a6b3e34f 100644
--- a/frontend/coprs_frontend/coprs/auth.py
+++ b/frontend/coprs_frontend/coprs/auth.py
@@ -142,7 +142,16 @@ def login():
 
         # TODO Ask for SSH public key. Anybody knows where is the list of
         # available keys that we can ask for?
-        # import ipdb; ipdb.set_trace()
+        #
+        # According to the documentation, we can ask only for a predefined set
+        # of values and SSH keys are not between them.
+        # https://pythonhosted.org/Flask-OpenID/#flask_openid.OpenID.try_login
+        #
+        # We might need to login using Kerberos and download
+        # https://fasjson.fedoraproject.org/v1/users/frostyx/
+        # The kerberos usage on servers is quite simple, FrostyX uses the
+        # following command for fedora-sponsors:
+        #   kinit -kt /home/fedora/kt fedorathirdparty@FEDORAPROJECT.ORG
 
         return oid.try_login(app.config["OPENID_PROVIDER_URL"],
                             ask_for=["email", "timezone"],