diff --git a/doc.go b/doc.go
index 6f5a7e2..4174c6d 100644
--- a/doc.go
+++ b/doc.go
@@ -1,3 +1,3 @@
-// Package bitempura contains experiments with bitemporal data.
-// It defines an interface for bitemporal key-value databases.
+// Package bitempura defines a bitemporal key-value database.
+// See bitempura/memory for implementation.
 package bitempura
diff --git a/memory/doc.go b/memory/doc.go
index bd8db37..028f583 100644
--- a/memory/doc.go
+++ b/memory/doc.go
@@ -1,2 +1,3 @@
-// Package memory contains in-memory reference implementation of bitempura.DB
+// Package memory implements an in-memory, bitemporal key-value database.
+// This is the reference implementation of bitempura.DB.
 package memory