diff --git a/library/src/main/java/com/google/android/exoplayer2/extractor/mp4/Track.java b/library/src/main/java/com/google/android/exoplayer2/extractor/mp4/Track.java
index d673564dc4..f1c4e99ec1 100644
--- a/library/src/main/java/com/google/android/exoplayer2/extractor/mp4/Track.java
+++ b/library/src/main/java/com/google/android/exoplayer2/extractor/mp4/Track.java
@@ -93,7 +93,7 @@ public final class Track {
   public final long[] editListMediaTimes;
 
   /**
-   * For H264 video tracks, the length in bytes of the NALUnitLength field in each sample. -1 for
+   * For H264 video tracks, the length in bytes of the NALUnitLength field in each sample. 0 for
    * other track types.
    */
   public final int nalUnitLengthFieldLength;