diff --git a/js/actionCreators/playlist.ts b/js/actionCreators/playlist.ts
index b5185fac..8e9561d6 100644
--- a/js/actionCreators/playlist.ts
+++ b/js/actionCreators/playlist.ts
@@ -28,6 +28,8 @@ export function cropPlaylist(): Dispatchable {
     } = getState();
     dispatch({
       type: REMOVE_TRACKS,
+      // @ts-ignore The keys are numbers, but TypeScript does not trust us.
+      // https://github.com/Microsoft/TypeScript/pull/12253#issuecomment-263132208
       ids: Object.keys(tracks).filter(id => !tracks[id].selected)
     });
   };
@@ -40,6 +42,8 @@ export function removeSelectedTracks(): Dispatchable {
     } = getState();
     dispatch({
       type: REMOVE_TRACKS,
+      // @ts-ignore The keys are numbers, but TypeScript does not trust us.
+      // https://github.com/Microsoft/TypeScript/pull/12253#issuecomment-263132208
       ids: Object.keys(tracks).filter(id => tracks[id].selected)
     });
   };
diff --git a/js/types.ts b/js/types.ts
index cbe039d9..2afc18b0 100644
--- a/js/types.ts
+++ b/js/types.ts
@@ -426,6 +426,8 @@ export interface PlaylistTrack {
 
 export interface PlaylistState {
   trackOrder: number[];
+  // https://github.com/Microsoft/TypeScript/pull/12253#issuecomment-263132208
+  // TODO: Using numbers for keys is kinda annoying. Consider retyping as string
   tracks: { [id: number]: PlaylistTrack };
   lastSelectedIndex: number | null;
   currentTrack: number | null;