diff --git a/library/core/src/main/java/com/google/android/exoplayer2/C.java b/library/core/src/main/java/com/google/android/exoplayer2/C.java
index 6c72dd8d0a..fac9818d9e 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/C.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/C.java
@@ -978,7 +978,10 @@ public final class C {
   }
 
   /**
-   * Returns a newly generated {@link android.media.AudioTrack} session identifier.
+   * Returns a newly generated audio session identifier, or {@link AudioManager#ERROR} if an error
+   * occurred in which case audio playback may fail.
+   *
+   * @see AudioManager#generateAudioSessionId()
    */
   @TargetApi(21)
   public static int generateAudioSessionIdV21(Context context) {