diff --git a/carddav/carddav.go b/carddav/carddav.go
index 269db83..af20174 100644
--- a/carddav/carddav.go
+++ b/carddav/carddav.go
@@ -1,3 +1,5 @@
+// Package carddav provides a CardDAV server implementation, as defined in
+// RFC 6352.
 package carddav
 
 import (
diff --git a/webdav.go b/webdav.go
index 0aea59b..0307863 100644
--- a/webdav.go
+++ b/webdav.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package webdav provides a WebDAV server implementation.
+// Package webdav provides a WebDAV server implementation, as defined in
+// RFC 4918.
 package webdav
 
 import (