-#define AUTHMODE_NATIVE 0 /* native Citadel authentication */
-#define AUTHMODE_HOST 1 /* host integrated */
-#define AUTHMODE_LDAP 2 /* external LDAP authentication */
+#define AUTHMODE_NATIVE 0 /* Native (self-contained or "black box") */
+#define AUTHMODE_HOST 1 /* Authenticate against the host OS user database */
+#define AUTHMODE_LDAP 2 /* External LDAP authentication (NOT IMPLEMENTED) */