diff --git a/EBSDAnalysis/@grainBoundary/grainBoundary.m b/EBSDAnalysis/@grainBoundary/grainBoundary.m
index dbede5ea3..845f1ea86 100644
--- a/EBSDAnalysis/@grainBoundary/grainBoundary.m
+++ b/EBSDAnalysis/@grainBoundary/grainBoundary.m
@@ -46,6 +46,7 @@
   
   % general properties
   properties
+    segments = []   % list of boundary segments as [v1 v2 v3 NaN v4 v5]
     scanUnit = 'um' % unit of the vertex coordinates
     triplePoints = triplePointList  % triple points
   end