diff --git a/rules/manager.go b/rules/manager.go
index 92675e71d..acc637e71 100644
--- a/rules/manager.go
+++ b/rules/manager.go
@@ -190,7 +190,7 @@ func (m *Manager) Stop() {
 
 // Update the rule manager's state as the config requires. If
 // loading the new rules failed the old rule set is restored.
-// This method will no-op in case the manager is already stopped
+// This method will no-op in case the manager is already stopped.
 func (m *Manager) Update(interval time.Duration, files []string, externalLabels labels.Labels, externalURL string, groupEvalIterationFunc GroupEvalIterationFunc) error {
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
diff --git a/rules/manager_test.go b/rules/manager_test.go
index ec967df24..51239e6c9 100644
--- a/rules/manager_test.go
+++ b/rules/manager_test.go
@@ -2111,7 +2111,7 @@ func TestUpdateWhenStopped(t *testing.T) {
 	require.NotEmpty(t, ruleManager.groups)
 
 	ruleManager.Stop()
-	// Updates following a stop are no-op
+	// Updates following a stop are no-op.
 	err = ruleManager.Update(10*time.Second, []string{}, labels.EmptyLabels(), "", nil)
 	require.NoError(t, err)
 }