diff --git a/cmd/mdatagen/metadata-schema.yaml b/cmd/mdatagen/metadata-schema.yaml
index f746de078fd..eb15a9775cf 100644
--- a/cmd/mdatagen/metadata-schema.yaml
+++ b/cmd/mdatagen/metadata-schema.yaml
@@ -168,4 +168,5 @@ telemetry:
         # Bucket boundaries are only available to set for histogram metrics.
         bucket_boundaries: [double]
       # Optional: array of attributes that were defined in the attributes section that are emitted by this metric.
+      # Note: Only the following attribute types are supported: <string|int|double|bool>
       attributes: [string]