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-rw-r--r--doc/guix.texi8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index fb2834942b..03cd2d5d71 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -30,7 +30,7 @@ Copyright @copyright{} 2016, 2017 ng0@*
 Copyright @copyright{} 2016, 2017 Jan Nieuwenhuizen@*
 Copyright @copyright{} 2016 Julien Lepiller@*
 Copyright @copyright{} 2016 Alex ter Weele@*
-Copyright @copyright{} 2017 Clément Lassieur@*
+Copyright @copyright{} 2017, 2018 Clément Lassieur@*
 Copyright @copyright{} 2017 Mathieu Othacehe@*
 Copyright @copyright{} 2017 Federico Beffa@*
 Copyright @copyright{} 2017 Carlo Zancanaro@*
@@ -15735,6 +15735,12 @@ generation, the initial certification request to the Let's Encrypt
 service, the web server challenge/response integration, writing the
 certificate to disk, and the automated periodic renewals.
 
+Certbot is run twice a day, at a random minute within the hour.  It
+won't do anything until your certificates are due for renewal or
+revoked, but running it regularly would give your service a chance of
+staying online in case a Let's Encrypt-initiated revocation happened for
+some reason.
+
 @defvr {Scheme Variable} certbot-service-type
 A service type for the @code{certbot} Let's Encrypt client.
 @end defvr