diff --git a/connector/spanmetricsconnector/README.md b/connector/spanmetricsconnector/README.md
index 966787e39831..3287c283575c 100644
--- a/connector/spanmetricsconnector/README.md
+++ b/connector/spanmetricsconnector/README.md
@@ -121,6 +121,7 @@ The following settings can be optionally configured:
 - `events`: Use to configure the events metric.
   - `enabled`: (default: `false`): enabling will add the events metric.
   - `dimensions`: (mandatory if `enabled`) the list of the span's event attributes to add as dimensions to the events metric, which will be included _on top of_ the common and configured `dimensions` for span and resource attributes.
+- `resource_metrics_key_attributes`: Filter the resource attributes used to produce the resource metrics key map hash. Use this in case changing resource attributes (e.g. process id) are breaking counter metrics.
 
 ## Examples
 
@@ -157,6 +158,10 @@ connectors:
       dimensions:
         - name: exception.type
         - name: exception.message
+    resource_metrics_key_attributes:
+      - service.name
+      - telemetry.sdk.language
+      - telemetry.sdk.name
 
 service:
   pipelines: