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diff --git a/doc/guix.texi b/doc/guix.texi
index 583bdbf621..ed2b81ba33 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1642,6 +1642,35 @@ debugging information''), which roughly means that code is compiled with
@code{-O2 -g}, as is the case for Autoconf-based packages by default.
@end defvr
+@defvr {Scheme Variable} glib-or-gtk-build-system
+This variable is exported by @code{(guix build-system glib-or-gtk)}. It
+is intended for use with packages making use of GLib or GTK+.
+
+This build system adds the following two phases to the ones defined by
+@var{gnu-build-system}:
+
+@table @code
+@item glib-or-gtk-wrap
+The phase @code{glib-or-gtk-wrap} ensures that programs found under
+@file{bin/} are able to find GLib's ``schemas'' and
+@uref{https://developer.gnome.org/gtk3/stable/gtk-running.html, GTK+
+modules}. This is achieved by wrapping the programs in launch scripts
+that appropriately set the @code{XDG_DATA_DIRS} and @code{GTK_PATH}
+environment variables.
+
+@item glib-or-gtk-compile-schemas
+The phase @code{glib-or-gtk-compile-schemas} makes sure that all GLib's
+@uref{https://developer.gnome.org/gio/stable/glib-compile-schemas.html,
+GSettings schemas} are compiled. Compilation is performed by the
+@command{glib-compile-schemas} program. It is provided by the package
+@code{glib:bin} which is automatically imported by the build system.
+The @code{glib} package providing @command{glib-compile-schemas} can be
+specified with the @code{#:glib} parameter.
+@end table
+
+Both phases are executed after the @code{install} phase.
+@end defvr
+
@defvr {Scheme Variable} python-build-system
This variable is exported by @code{(guix build-system python)}. It
implements the more or less standard build procedure used by Python