diff --git a/README.md b/README.md
index 8fbb8f1b..65898d0a 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ that are tied to a machine.
 To use it, set the `--collector.textfile.directory` flag on the Node exporter. The
 collector will parse all files in that directory matching the glob `*.prom`
 using the [text
-format](http://prometheus.io/docs/instrumenting/exposition_formats/).
+format](http://prometheus.io/docs/instrumenting/exposition_formats/). **Note:** Timestamps are not supported.
 
 To atomically push completion time for a cron job:
 ```