diff --git a/carddav/carddav.go b/carddav/carddav.go
index 9f1d9a2..6840d95 100644
--- a/carddav/carddav.go
+++ b/carddav/carddav.go
@@ -1,3 +1,6 @@
+// Package carddav provides a client and server CardDAV implementation.
+//
+// CardDAV is defined in RFC 6352.
 package carddav
 
 import (
diff --git a/carddav/client.go b/carddav/client.go
index bb34db3..cc86f67 100644
--- a/carddav/client.go
+++ b/carddav/client.go
@@ -45,6 +45,7 @@ func Discover(domain string) (string, error) {
 	return u.String(), nil
 }
 
+// Client provides access to a remote CardDAV server.
 type Client struct {
 	*webdav.Client
 
diff --git a/carddav/server.go b/carddav/server.go
index 5470e75..24257f8 100644
--- a/carddav/server.go
+++ b/carddav/server.go
@@ -11,6 +11,7 @@ import (
 
 // TODO: add support for multiple address books
 
+// Backend is a CardDAV server backend.
 type Backend interface {
 	AddressBook() (*AddressBook, error)
 	GetAddressObject(href string) (*AddressObject, error)
@@ -18,10 +19,13 @@ type Backend interface {
 	QueryAddressObjects(query *AddressBookQuery) ([]AddressObject, error)
 }
 
+// Handler handles CardDAV HTTP requests. It can be used to create a CardDAV
+// server.
 type Handler struct {
 	Backend Backend
 }
 
+// ServeHTTP implements http.Handler.
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if h.Backend == nil {
 		http.Error(w, "carddav: no backend available", http.StatusInternalServerError)
diff --git a/client.go b/client.go
index f070a78..a044b18 100644
--- a/client.go
+++ b/client.go
@@ -11,6 +11,7 @@ import (
 	"github.com/emersion/go-webdav/internal"
 )
 
+// Client provides access to a remote WebDAV filesystem.
 type Client struct {
 	ic *internal.Client
 }
diff --git a/server.go b/server.go
index adb500e..e2603fe 100644
--- a/server.go
+++ b/server.go
@@ -17,16 +17,20 @@ type File interface {
 	io.Seeker
 }
 
+// FileSystem is a WebDAV server backend.
 type FileSystem interface {
 	Open(name string) (File, error)
 	Stat(name string) (os.FileInfo, error)
 	Readdir(name string) ([]os.FileInfo, error)
 }
 
+// Handler handles WebDAV HTTP requests. It can be used to create a WebDAV
+// server.
 type Handler struct {
 	FileSystem FileSystem
 }
 
+// ServeHTTP implements http.Handler.
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if h.FileSystem == nil {
 		http.Error(w, "webdav: no filesystem available", http.StatusInternalServerError)
diff --git a/webdav.go b/webdav.go
new file mode 100644
index 0000000..0699e62
--- /dev/null
+++ b/webdav.go
@@ -0,0 +1,4 @@
+// Package webdav provides a client and server WebDAV filesystem implementation.
+//
+// WebDAV is defined in RFC 4918.
+package webdav