diff --git a/Union_find/doc_tex/Union_find_ref/Union_find.tex b/Union_find/doc_tex/Union_find_ref/Union_find.tex
index c5365a2e096..dc5dfd47d7d 100644
--- a/Union_find/doc_tex/Union_find_ref/Union_find.tex
+++ b/Union_find/doc_tex/Union_find_ref/Union_find.tex
@@ -8,6 +8,8 @@ parameter \ccc{A} has to be a model of the allocator concept as defined
 in the C++ standard. It has a default argument \ccc{CGAL_ALLOCATOR(T)}.
 
 
+\ccInclude{CGAL/Union_find.h}
+
 \ccSetOneOfTwoColumns{6.5cm}
 
 \ccTypes