diff --git a/specification/metrics/sdk.md b/specification/metrics/sdk.md
index 72c87212601..8bf9ab2da9e 100644
--- a/specification/metrics/sdk.md
+++ b/specification/metrics/sdk.md
@@ -73,7 +73,11 @@ linkTitle: SDK
   * [Pull Metric Exporter](#pull-metric-exporter)
 - [MetricProducer](#metricproducer)
   * [Interface Definition](#interface-definition-1)
-    + [Produce() batch](#produce-batch)
+    + [Produce batch](#produce-batch)
+- [MetricFilter](#metricfilter)
+  * [Interface Definition](#interface-definition-2)
+    + [TestMetric](#testmetric)
+    + [TestAttributes](#testattributes)
 - [Defaults and configuration](#defaults-and-configuration)
 - [Numerical limits handling](#numerical-limits-handling)
 - [Compatibility requirements](#compatibility-requirements)