From 881c61d06222a30dbffbf9d039eaca2abd3d22b3 Mon Sep 17 00:00:00 2001
From: Chris Marusich <cmmarusich@gmail.com>
Date: Thu, 29 Mar 2018 07:29:49 +0200
Subject: [PATCH] doc: Improve <service-type> documentation.
* doc/guix.texi (Service Reference): Correct and clarify some statements
regarding the "compose" and "extend" procedures of <service-type>.
---
doc/guix.texi | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index b6d041d73e1..25c08b9f06e 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -21090,16 +21090,16 @@ services.
Otherwise, it must be a one-argument procedure. The procedure is called
by @code{fold-services} and is passed a list of values collected from
-extensions. It must return a value that is a valid parameter value for
-the service instance.
+extensions. It may return any single value.
@item @code{extend} (default: @code{#f})
If this is @code{#f}, services of this type cannot be extended.
Otherwise, it must be a two-argument procedure: @code{fold-services}
-calls it, passing it the initial value of the service as the first argument
-and the result of applying @code{compose} to the extension values as the
-second argument.
+calls it, passing it the initial value of the service as the first
+argument and the result of applying @code{compose} to the extension
+values as the second argument. It must return a value that is a valid
+parameter value for the service instance.
@end table
@xref{Service Types and Services}, for examples.
--
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