3 files changed, 12 insertions, 0 deletions
diff --git a/pkg/media/library.go b/pkg/media/library.go
index 337907d..c0d79eb 100644
--- a/pkg/media/library.go
+++ b/pkg/media/library.go
@@ -9,11 +9,13 @@ import (
 	"sync"
 )
 
+// Library manages importing and retrieving video data.
 type Library struct {
 	mu     sync.RWMutex
 	Videos map[string]*Video
 }
 
+// NewLibrary returns new instance of Library.
 func NewLibrary() *Library {
 	lib := &Library{
 		Videos: make(map[string]*Video),
@@ -21,6 +23,7 @@ func NewLibrary() *Library {
 	return lib
 }
 
+// Import adds all valid videos from a given path.
 func (lib *Library) Import(path string) error {
 	files, err := ioutil.ReadDir(path)
 	if err != nil {
@@ -36,6 +39,7 @@ func (lib *Library) Import(path string) error {
 	return nil
 }
 
+// Add adds a single video from a given file path.
 func (lib *Library) Add(path string) error {
 	v, err := ParseVideo(path)
 	if err != nil {
@@ -48,6 +52,7 @@ func (lib *Library) Add(path string) error {
 	return nil
 }
 
+// Remove removes a single video from a given file path.
 func (lib *Library) Remove(path string) {
 	name := filepath.Base(path)
 	// ID is name without extension
@@ -65,6 +70,7 @@ func (lib *Library) Remove(path string) {
 	}
 }
 
+// Playlist returns a sorted Playlist of all videos.
 func (lib *Library) Playlist() Playlist {
 	lib.mu.RLock()
 	defer lib.mu.RUnlock()
diff --git a/pkg/media/playlist.go b/pkg/media/playlist.go
index 86dcb76..cf8edcf 100644
--- a/pkg/media/playlist.go
+++ b/pkg/media/playlist.go
@@ -1,15 +1,19 @@
 package media
 
+// Playlist holds an array of videos capable of sorting by Timestamp.
 type Playlist []*Video
 
+// Len returns length of array (for sorting).
 func (p Playlist) Len() int {
 	return len(p)
 }
 
+// Swap swaps two values in array by index (for sorting).
 func (p Playlist) Swap(i, j int) {
 	p[i], p[j] = p[j], p[i]
 }
 
+// Less returns true if p[i] Timestamp is after p[j] (for sorting).
 func (p Playlist) Less(i, j int) bool {
 	return p[i].Timestamp.After(p[j].Timestamp)
 }
diff --git a/pkg/media/video.go b/pkg/media/video.go
index 2499433..90ec595 100644
--- a/pkg/media/video.go
+++ b/pkg/media/video.go
@@ -8,6 +8,7 @@ import (
 	"github.com/dhowden/tag"
 )
 
+// Video represents metadata for a single video.
 type Video struct {
 	ID          string
 	Title       string
@@ -20,6 +21,7 @@ type Video struct {
 	Timestamp   time.Time
 }
 
+// ParseVideo parses a video file's metadata and returns a Video.
 func ParseVideo(path string) (*Video, error) {
 	f, err := os.Open(path)
 	if err != nil {