diff --git a/src/aid/EVENT/Track.aid b/src/aid/EVENT/Track.aid
index 9b404aa58..31fde050a 100644
--- a/src/aid/EVENT/Track.aid
+++ b/src/aid/EVENT/Track.aid
@@ -115,6 +115,13 @@ public interface Track extends LCObject {
      */
     public const IntVec& getSubdetectorHitNumbers() const ;
 
+    /** A vector that holds the number of holes in particular subdetectors.
+     *  The mapping of indices to subdetectors is implementation dependent.
+     *  To be used as convenient information or if holes are not stored in
+     *  the data set, e.g. DST or FastMC.
+     *  Check/set collection variable TrackSubdetectorNames for decoding the indices.
+     */
+    public const IntVec& getSubdetectorHoleNumbers() const ;
 
     /** The tracks that have been combined to this track.
      */