diff --git a/pkg/osutil/paths.go b/pkg/osutil/paths.go
index 60a8a2761..96615ab78 100644
--- a/pkg/osutil/paths.go
+++ b/pkg/osutil/paths.go
@@ -36,6 +36,8 @@ func HomeDir() string {
 	return os.Getenv("HOME")
 }
 
+// Username returns the current user's username, as
+// reported by the relevant environment variable.
 func Username() string {
 	if runtime.GOOS == "windows" {
 		return os.Getenv("USERNAME")