diff --git a/plugins/inputs/gnmi/README.md b/plugins/inputs/gnmi/README.md
index 2956043bd..0969c239d 100644
--- a/plugins/inputs/gnmi/README.md
+++ b/plugins/inputs/gnmi/README.md
@@ -86,6 +86,12 @@ It has been optimized to support gNMI telemetry as produced by Cisco IOS XR
 
 ```
 
+## Metrics
+
+Each configured subscription will emit a different measurement.  Each leaf in a
+GNMI SubscribeResponse Update message will produce a field reading in the
+measurement. GNMI PathElement keys for leaves will attach tags to the field(s).
+
 ## Example Output
 
 ```shell