clarify song order in AddPlayLogRequest

api/api.go

@@ -31,6 +31,8 @@ type GetManySongsResponse struct {
 	Results []*Song `json:"results"`
 }
 
+// Add an entry to the playlog. Songs are in increasing time order
+// (most recently played last).
 type AddPlayLogRequest struct {
 	Songs []SongID `json:"songs"`
 }