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-rw-r--r--doc/guix.texi15
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diff --git a/doc/guix.texi b/doc/guix.texi
index 622a4e76f06..13665b568d7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -52511,6 +52511,21 @@ providing a @file{~/.config/sway/config} file,
@item
adding Sway-related packages to your profile.
@end itemize
+
+It is possible to extend this service (@pxref{Service Composition}).
+The resulting configuration file contains the concatenation of
+keybindings, modes, @i{etc.}@: found in all extensions.
+
+@quotation Note
+At the moment, only one bar configuration is allowed. If more are
+found, an error will be raised.
+@end quotation
+@end defvar
+
+@defvar %empty-sway-configuration
+The variable @code{%empty-sway-configuration} contains an empty
+@code{sway-configuration} record. This value can help users write
+simple service extensions.
@end defvar
@deftp {Data Type} sway-configuration