-Two modes are supported, direct usage of the received username and password
-to try to acquire credentials via GSSAPI, or forwarding to following apache
-module.
+If the browser fails to use Negotiate is will instead fallback to Basic and
+the username and password will be used to try to acquire credentials in the
+module via GSSAPI. If credentials are acquire successfully then they are
+validated agaist the server's keytab.
+
+Enable with: GssapiBasicAuth On
+Default: GssapiBasicAuth Off