diff --git a/cmake/lcio.xml.in b/cmake/lcio.xml.in
index c4e72aa52..cfae2a07d 100644
--- a/cmake/lcio.xml.in
+++ b/cmake/lcio.xml.in
@@ -594,6 +594,7 @@
 	<data type="int" name="ndf">ndf of fit</data>
 	<data type="float" name="dEdx">dEdx</data>
 	<data type="float" name="dEdxError">Error of dEdx</data>
+	<data type="int" name="Nholes">number of holes in track</data>
 	<data type="float" name="radiusOfInnermostHit">radius of innermost hit used in track fit</data>
 	<data type="int" name="nHitNumbers"></data>
 	<repeat count="nHitNumbers">