diff --git a/sources/zweic/Tree.scala b/sources/zweic/Tree.scala
index 90e1d92..438783b 100755
--- a/sources/zweic/Tree.scala
+++ b/sources/zweic/Tree.scala
@@ -69,7 +69,7 @@
 /* T = Int */
 case class IntType extends TypeTree;
 
-/* T = Null /
+/* T = Null */
 case class NullType extends TypeTree;
 
 /* T = ClassType name */