diff --git a/storage/memorybysubnet/peer_store.go b/storage/memorybysubnet/peer_store.go
index 34fffa1..35da7e8 100644
--- a/storage/memorybysubnet/peer_store.go
+++ b/storage/memorybysubnet/peer_store.go
@@ -1,3 +1,6 @@
+// Package memorybysubnet implements the storage interface for a Chihaya
+// BitTorrent tracker keeping peer data in memory organized by a pre-configured
+// subnet.
 package memorybysubnet
 
 import (