Index: /issm/trunk-jpl/src/m/classes/mesh3dprisms.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/mesh3dprisms.m	(revision 23980)
+++ /issm/trunk-jpl/src/m/classes/mesh3dprisms.m	(revision 23981)
@@ -105,4 +105,5 @@
 			md = checkfield(md,'fieldname','mesh.numberofelements','>',0);
 			md = checkfield(md,'fieldname','mesh.numberofvertices','>',0);
+			md = checkfield(md,'fieldname','mesh.vertexonboundary','size',[md.mesh.numberofvertices 1],'values',[0 1]);
 			md = checkfield(md,'fieldname','mesh.vertexonbase','size',[md.mesh.numberofvertices 1],'values',[0 1]);
 			md = checkfield(md,'fieldname','mesh.vertexonsurface','size',[md.mesh.numberofvertices 1],'values',[0 1]);
@@ -178,4 +179,5 @@
 			WriteData(fid,prefix,'object',self,'class','mesh','fieldname','numberofelements','format','Integer');
 			WriteData(fid,prefix,'object',self,'class','mesh','fieldname','numberofvertices','format','Integer');
+			WriteData(fid,prefix,'object',self,'class','mesh','fieldname','vertexonboundary','format','BooleanMat','mattype',1);
 			WriteData(fid,prefix,'object',self,'class','mesh','fieldname','vertexonbase','format','BooleanMat','mattype',1);
 			WriteData(fid,prefix,'object',self,'class','mesh','fieldname','vertexonsurface','format','BooleanMat','mattype',1);