diff --git a/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/open.tex b/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/open.tex
index 3c04f5fbefe..85da71dc573 100644
--- a/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/open.tex
+++ b/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/open.tex
@@ -22,7 +22,8 @@ Note that Polynomials are not part of this package.
 
 TODO: (after merge) 
 \begin{itemize}
-\item document function \ccc{is_exact}
+\item document function \ccc{is_exact}? is it needed? 
+\item add static const bool to \ccc{Tag_true}  \ccc{Tag_false}. 
 \item remove broken links within pdf
 \item add concept \ccc{FromDoubleConstructible}
 \item find a place for basic stuff. see section remarks