diff --git a/src/utils/mutateInternal.ts b/src/utils/mutateInternal.ts
index f068543cf..164db7a78 100644
--- a/src/utils/mutateInternal.ts
+++ b/src/utils/mutateInternal.ts
@@ -32,6 +32,18 @@ import * as is from 'is';
 import {Mutation} from '../mutation';
 import arrify = require('arrify');
 
+/**
+ * Applies a set of changes to be atomically applied to the specified row(s).
+ * Mutations are applied in order, meaning that earlier mutations can be masked
+ * by later ones. This internal function handles the retry logic and metrics collection
+ * for the mutate operation.
+ *
+ * @param {TabularApiSurface} table The table or authorized view to perform the mutation on.
+ * @param {OperationMetricsCollector} metricsCollector The metrics collector for the operation.
+ * @param {Entry | Entry[]} entriesRaw List of entities to be inserted or deleted.
+ * @param {MutateOptions | MutateCallback} [optionsOrCallback] Configuration object or callback function.
+ * @param {MutateCallback} [cb] The callback function.
+ */
 export function mutateInternal(
   table: TabularApiSurface,
   metricsCollector: OperationMetricsCollector,
diff --git a/system-test/client-side-metrics-all-methods.ts b/system-test/client-side-metrics-all-methods.ts
index a10d71af3..882242833 100644
--- a/system-test/client-side-metrics-all-methods.ts
+++ b/system-test/client-side-metrics-all-methods.ts
@@ -92,7 +92,7 @@ function checkFirstResponseLatency(requestHandled: OnOperationCompleteData) {
   delete requestHandled.firstResponseLatency;
 }
 
-function readRowsAssertionCheck(
+function metricsAssertionCheck(
   projectId: string,
   requestsHandled: (OnOperationCompleteData | OnAttemptCompleteData)[] = [],
   method: string,
@@ -207,7 +207,7 @@ function checkMultiRowCall(
   projectId: string,
   requestsHandled: (OnOperationCompleteData | OnAttemptCompleteData)[] = [],
 ) {
-  readRowsAssertionCheck(
+  metricsAssertionCheck(
     projectId,
     requestsHandled,
     'Bigtable.ReadRows',
@@ -219,7 +219,7 @@ function checkMutateRowsCall(
   projectId: string,
   requestsHandled: (OnOperationCompleteData | OnAttemptCompleteData)[] = [],
 ) {
-  readRowsAssertionCheck(
+  metricsAssertionCheck(
     projectId,
     requestsHandled,
     'Bigtable.MutateRows',
@@ -243,7 +243,7 @@ function checkMutateRowCall(
   projectId: string,
   requestsHandled: (OnOperationCompleteData | OnAttemptCompleteData)[] = [],
 ) {
-  readRowsAssertionCheck(
+  metricsAssertionCheck(
     projectId,
     requestsHandled,
     'Bigtable.MutateRow',
@@ -255,7 +255,7 @@ function checkSingleRowCall(
   projectId: string,
   requestsHandled: (OnOperationCompleteData | OnAttemptCompleteData)[] = [],
 ) {
-  readRowsAssertionCheck(
+  metricsAssertionCheck(
     projectId,
     requestsHandled,
     'Bigtable.ReadRow',