diff --git a/tensorboard/webapp/feature_flag/store/feature_flag_metadata.ts b/tensorboard/webapp/feature_flag/store/feature_flag_metadata.ts
index 52d7ad11ce..042eb1f16b 100644
--- a/tensorboard/webapp/feature_flag/store/feature_flag_metadata.ts
+++ b/tensorboard/webapp/feature_flag/store/feature_flag_metadata.ts
@@ -130,6 +130,11 @@ export const FeatureFlagMetadataMap: FeatureFlagMetadataMapType<FeatureFlags> =
       queryParamOverride: 'enableScalarColumnCustomization',
       parseValue: parseBoolean,
     },
+    enableHparamsInTimeSeries: {
+      defaultValue: false,
+      queryParamOverride: 'enableHparamsInTimeSeries',
+      parseValue: parseBoolean,
+    },
   };
 
 /**
diff --git a/tensorboard/webapp/feature_flag/types.ts b/tensorboard/webapp/feature_flag/types.ts
index 3f9ea33ebc..fbbb309bad 100644
--- a/tensorboard/webapp/feature_flag/types.ts
+++ b/tensorboard/webapp/feature_flag/types.ts
@@ -54,4 +54,6 @@ export interface FeatureFlags {
   // Adds affordance for users to select and reorder the columns in the Scalar
   // Card Data Table
   enableScalarColumnCustomization: boolean;
+  // Adds hparam columns to the runs table and the scalar card data table.
+  enableHparamsInTimeSeries: boolean;
 }