diff --git a/doc/iterator_adaptor_ref.rst b/doc/iterator_adaptor_ref.rst
index 7226341..a51e2e9 100644
--- a/doc/iterator_adaptor_ref.rst
+++ b/doc/iterator_adaptor_ref.rst
@@ -43,7 +43,7 @@
       Base m_iterator;
   };
 
-__ :
+__ : THE LINK HERE IS MISSING!
 
 ``iterator_adaptor`` requirements
 ---------------------------------