diff --git a/internal/driver/mock/mock.go b/internal/driver/mock/mock.go
index 42f38f7..a6f0f13 100644
--- a/internal/driver/mock/mock.go
+++ b/internal/driver/mock/mock.go
@@ -1,3 +1,4 @@
+// Package mock provides an in-memory device driver that records actions for tests.
 package mock
 
 import (
diff --git a/internal/driver/sidecar/client.go b/internal/driver/sidecar/client.go
index 4495766..7374a47 100644
--- a/internal/driver/sidecar/client.go
+++ b/internal/driver/sidecar/client.go
@@ -1,3 +1,4 @@
+// Package sidecar implements the device driver by talking to the native sidecar over gRPC.
 package sidecar
 
 import (