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diff --git a/doc/guix.texi b/doc/guix.texi
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@@ -4652,6 +4652,7 @@ declaration.
* Networking Services:: Network setup, SSH daemon, etc.
* X Window:: Graphical display.
* Desktop Services:: D-Bus and desktop services.
+* Database Services:: SQL databases.
* Various Services:: Other services.
@end menu
@@ -5046,6 +5047,20 @@ tool. See @uref{http://www.freedesktop.org/software/colord/, the colord web
site} for more information.
@end deffn
+@node Database Services
+@subsubsection Database Services
+
+The @code{(gnu services databases)} module provides the following service.
+
+@deffn {Monadic Procedure} postgresql-service [#:postgresql postgresql] @
+ [#:config-file] [#:data-directory ``/var/lib/postgresql/data'']
+Return a service that runs @var{postgresql}, the PostgreSQL database
+server.
+
+The PostgreSQL daemon loads its runtime configuration from
+@var{config-file} and stores the database cluster in
+@var{data-directory}.
+@end deffn
@node Various Services
@subsubsection Various Services