diff --git a/ontologies/mathex_onto.thy b/ontologies/mathex_onto.thy
index 7060964e..2a00ee42 100644
--- a/ontologies/mathex_onto.thy
+++ b/ontologies/mathex_onto.thy
@@ -16,4 +16,7 @@ doc_class Exercise_part =
 doc_class Exercise= 
   content :: "(Exercise_part) list"
 
+doc_class MathExam=
+  content :: "(Exercise) list"
+
 end
\ No newline at end of file