diff --git a/guix/scripts/weather.scm b/guix/scripts/weather.scm
index 08a1b22a74..98a09f9e9a 100644
--- a/guix/scripts/weather.scm
+++ b/guix/scripts/weather.scm
@@ -643,7 +643,7 @@ (define-command (guix-weather . args)
                              ;; substitute URLs, presumably because it's too
                              ;; old.
                              (warning (G_ "using default \
-substitute URLs~%"))
+substitute URLs; maybe the daemon's too old~%"))
                              %default-substitute-urls)))
              (systems  (match (filter-map (match-lambda
                                             (('system . system) system)