diff --git a/hub.go b/hub.go
index 7247cb1..93d95b6 100644
--- a/hub.go
+++ b/hub.go
@@ -2,6 +2,9 @@ package peco
 
 import "sync"
 
+// Hub acts as the messaging hub between components -- that is,
+// it controls how the communication that goes through channels
+// are handled.
 type Hub struct {
 	isSync      bool
 	mutex       *sync.Mutex
@@ -12,25 +15,38 @@ type Hub struct {
 	pagingCh    chan HubReq
 }
 
+// HubReq is a wrapper around the actual requst value that needs
+// to be passed. It contains an optional channel field which can
+// be filled to force synchronous communication between the
+// sender and receiver
 type HubReq struct {
 	data    interface{}
 	replyCh chan struct{}
 }
 
+// DataInterface returns the underlying data as interface{}
 func (hr HubReq) DataInterface() interface{} {
 	return hr.data
 }
 
+// DataString returns the underlying data as a string. Panics
+// if type conversion fails.
 func (hr HubReq) DataString() string {
 	return hr.data.(string)
 }
 
+// Done marks the request as done. If Hub is operating in
+// asynchronous mode (default), it's a no op. Otherwise it
+// sends a message back the reply channel to finish up the
+// synchronous communication
 func (hr HubReq) Done() {
-	if hr.replyCh != nil {
-		hr.replyCh <- struct{}{}
+	if hr.replyCh == nil {
+		return
 	}
+	hr.replyCh <- struct{}{}
 }
 
+// NewHub creates a new Hub struct
 func NewHub() *Hub {
 	return &Hub{
 		false,
@@ -71,42 +87,55 @@ func send(ch chan HubReq, r HubReq, needReply bool) {
 	ch <- r
 }
 
+// QueryCh returns the underlying channel for queries
 func (h *Hub) QueryCh() chan HubReq {
 	return h.queryCh
 }
 
+// SendQuery sends the query string to be processed by the Filter
 func (h *Hub) SendQuery(q string) {
 	send(h.QueryCh(), HubReq{q, nil}, h.isSync)
 }
 
+// LoopCh returns the channel to control the main execution loop.
+// Nothing should ever be sent through this channel. The only way
+// the channel communicates anything to its receivers is when
+// it is closed -- which is when peco is done.
 func (h *Hub) LoopCh() chan struct{} {
 	return h.loopCh
 }
 
+// DrawCh returns the channel to redraw the terminal display
 func (h *Hub) DrawCh() chan HubReq {
 	return h.drawCh
 }
 
+// SendDraw sends a request to redraw the terminal display
 func (h *Hub) SendDraw(matches []Match) {
 	send(h.DrawCh(), HubReq{matches, nil}, h.isSync)
 }
 
+// StatusMsgCh returns the channel to update the status message
 func (h *Hub) StatusMsgCh() chan HubReq {
 	return h.statusMsgCh
 }
 
+// SendStatusMsg sends a string to be displayed in the status message
 func (h *Hub) SendStatusMsg(q string) {
 	send(h.StatusMsgCh(), HubReq{q, nil}, h.isSync)
 }
 
+// PagingCh returns the channel to page through the results
 func (h *Hub) PagingCh() chan HubReq {
 	return h.pagingCh
 }
 
+// SendPaging sends a request to move the cursor around
 func (h *Hub) SendPaging(x PagingRequest) {
 	send(h.PagingCh(), HubReq{x, nil}, h.isSync)
 }
 
+// Stop closes the LoopCh so that peco shutsdown
 func (h *Hub) Stop() {
 	close(h.LoopCh())
 }