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-rw-r--r--doc/guix.texi5
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diff --git a/doc/guix.texi b/doc/guix.texi
index ed41091cae..6cd65b8739 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -21913,6 +21913,11 @@ The prometheus-node-exporter package to use.
@item @code{web-listen-address} (default: @code{":9100"})
Bind the web interface to the specified address.
+@item @code{textfile-directory} (default: @code{"/var/lib/prometheus/node-exporter"})
+This directory can be used to export metrics specific to this machine.
+Files containing metrics in the text format, with the filename ending in
+@code{.prom} should be placed in this directory.
+
@end table
@end deftp