diff --git a/plugins/inputs/tail/README.md b/plugins/inputs/tail/README.md
index 5d7253649..27cb6418e 100644
--- a/plugins/inputs/tail/README.md
+++ b/plugins/inputs/tail/README.md
@@ -1,4 +1,4 @@
-# tail Input Plugin
+# Tail Input Plugin
 
 The tail plugin "tails" a logfile and parses each log message.
 
@@ -49,3 +49,7 @@ The plugin expects messages in one of the
   data_format = "influx"
 ```
 
+### Metrics:
+
+Metrics are produced according to the `data_format` option.  Additionally a
+tag labeled `path` is added to the metric containing the filename being tailed.