diff --git a/mopidy/core/playback.py b/mopidy/core/playback.py
index 8a415257..ef3cc4b2 100644
--- a/mopidy/core/playback.py
+++ b/mopidy/core/playback.py
@@ -136,7 +136,7 @@ class PlaybackController(object):
         :param tl_track: track to change to
         :type tl_track: :class:`mopidy.models.TlTrack` or :class:`None`
         :param on_error_step: direction to step at play error, 1 for next
-            track (default), -1 for previous track
+            track (default), -1 for previous track. **INTERNAL**
         :type on_error_step: int, -1 or 1
         """
         old_state = self.state
@@ -217,7 +217,7 @@ class PlaybackController(object):
         :param tl_track: track to play
         :type tl_track: :class:`mopidy.models.TlTrack` or :class:`None`
         :param on_error_step: direction to step at play error, 1 for next
-            track (default), -1 for previous track
+            track (default), -1 for previous track. **INTERNAL**
         :type on_error_step: int, -1 or 1
         """
 
diff --git a/mopidy/core/tracklist.py b/mopidy/core/tracklist.py
index 48d20777..f9560a13 100644
--- a/mopidy/core/tracklist.py
+++ b/mopidy/core/tracklist.py
@@ -437,18 +437,18 @@ class TracklistController(object):
         return self._tl_tracks[start:end]
 
     def mark_playing(self, tl_track):
-        """Private method used by :class:`mopidy.core.PlaybackController`."""
+        """Method for :class:`mopidy.core.PlaybackController`. **INTERNAL**"""
         if self.random and tl_track in self._shuffled:
             self._shuffled.remove(tl_track)
 
     def mark_unplayable(self, tl_track):
-        """Private method used by :class:`mopidy.core.PlaybackController`."""
+        """Method for :class:`mopidy.core.PlaybackController`. **INTERNAL**"""
         logger.warning('Track is not playable: %s', tl_track.track.uri)
         if self.random and tl_track in self._shuffled:
             self._shuffled.remove(tl_track)
 
     def mark_played(self, tl_track):
-        """Private method used by :class:`mopidy.core.PlaybackController`."""
+        """Method for :class:`mopidy.core.PlaybackController`. **INTERNAL**"""
         if self.consume and tl_track is not None:
             self.remove(tlid=[tl_track.tlid])
             return True