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diff --git a/doc/guix.texi b/doc/guix.texi
index 3930b96836..510acddb46 100644
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@@ -557,6 +557,19 @@ system directories. By default, the latter contains @file{/dev} and
a separate mount name space, its own PID name space, network name space,
etc. This helps achieve reproducible builds (@pxref{Features}).
+When the daemon performs a build on behalf of the user, it creates a
+build directory under @file{/tmp} or under the directory specified by
+its @code{TMPDIR} environment variable; this directory is shared with
+the container for the duration of the build. Be aware that using a
+directory other than @file{/tmp} can affect build results---for example,
+with a longer directory name, a build process that uses Unix-domain
+sockets might hit the name length limitation for @code{sun_path}, which
+it would otherwise not hit.
+
+The build directory is automatically deleted upon completion, unless the
+build failed and the client specified @option{--keep-failed}
+(@pxref{Invoking guix build, @option{--keep-failed}}).
+
The following command-line options are supported:
@table @code