diff --git a/osutil/osutil.go b/osutil/osutil.go
index d472ed2b2..4a4de0e8c 100644
--- a/osutil/osutil.go
+++ b/osutil/osutil.go
@@ -2,6 +2,7 @@
 // All rights reserved. Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file.
 
+// Package osutil implements utilities for native OS support.
 package osutil
 
 import (
diff --git a/upgrade/upgrade_common.go b/upgrade/upgrade_common.go
index fddf83af1..6dd064420 100644
--- a/upgrade/upgrade_common.go
+++ b/upgrade/upgrade_common.go
@@ -2,6 +2,7 @@
 // All rights reserved. Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file.
 
+// Package upgrade downloads and compares releases, and upgrades the running binary.
 package upgrade
 
 import (
diff --git a/versioner/versioner.go b/versioner/versioner.go
index 3564b771b..c5d0d3efb 100644
--- a/versioner/versioner.go
+++ b/versioner/versioner.go
@@ -2,6 +2,8 @@
 // All rights reserved. Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file.
 
+// Package versioner implements common interfaces for file versioning and a
+// simple default versioning scheme.
 package versioner
 
 type Versioner interface {