diff --git a/internal/helm/chart/dependency_manager.go b/internal/helm/chart/dependency_manager.go
index e41020655..f44383621 100644
--- a/internal/helm/chart/dependency_manager.go
+++ b/internal/helm/chart/dependency_manager.go
@@ -41,13 +41,14 @@ type GetChartRepositoryCallback func(url string) (*repository.ChartRepository, e
 
 // DependencyManager manages dependencies for a Helm chart.
 type DependencyManager struct {
-	// repositories contains a map of Index indexed by their
-	// normalized URL. It is used as a lookup table for missing
-	// dependencies.
+	// repositories contains a map of repository.ChartRepository objects
+	// indexed by their repository.NormalizeURL.
+	// It is consulted as a lookup table for missing dependencies, based on
+	// the (repository) URL the dependency refers to.
 	repositories map[string]*repository.ChartRepository
 
 	// getRepositoryCallback can be set to an on-demand GetChartRepositoryCallback
-	// which returned result is cached to repositories.
+	// whose returned result is cached to repositories.
 	getRepositoryCallback GetChartRepositoryCallback
 
 	// concurrent is the number of concurrent chart-add operations during
@@ -91,6 +92,8 @@ func NewDependencyManager(opts ...DependencyManagerOption) *DependencyManager {
 	return dm
 }
 
+// Clear iterates over the repositories, calling Unload and RemoveCache on all
+// items. It returns a collection of (cache removal) errors.
 func (dm *DependencyManager) Clear() []error {
 	var errs []error
 	for _, v := range dm.repositories {
diff --git a/internal/helm/chart/metadata_test.go b/internal/helm/chart/metadata_test.go
index d9c882f43..07449100a 100644
--- a/internal/helm/chart/metadata_test.go
+++ b/internal/helm/chart/metadata_test.go
@@ -1,5 +1,5 @@
 /*
-Copyright 2020 The Flux authors
+Copyright 2021 The Flux authors
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
diff --git a/internal/helm/repository/chart_repository.go b/internal/helm/repository/chart_repository.go
index 654f55be1..8cee2e026 100644
--- a/internal/helm/repository/chart_repository.go
+++ b/internal/helm/repository/chart_repository.go
@@ -285,7 +285,7 @@ func (r *ChartRepository) CacheIndex() (string, error) {
 
 // StrategicallyLoadIndex lazy-loads the Index from CachePath using
 // LoadFromCache if it does not HasIndex.
-// If it not HasCacheFile, a cache attempt is made using CacheIndex
+// If not HasCacheFile, a cache attempt is made using CacheIndex
 // before continuing to load.
 func (r *ChartRepository) StrategicallyLoadIndex() (err error) {
 	if r.HasIndex() {
@@ -350,7 +350,7 @@ func (r *ChartRepository) HasCacheFile() bool {
 }
 
 // Unload can be used to signal the Go garbage collector the Index can
-// be freed from memory if the Index object is expected to
+// be freed from memory if the ChartRepository object is expected to
 // continue to exist in the stack for some time.
 func (r *ChartRepository) Unload() {
 	if r == nil {