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index fa6b34754..c1c6ce57b 100644
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@@ -178,6 +178,9 @@ provider~\cite{martens2015practical}. The customer should also not be
expected to withdraw exact change, as doing so reduces anonymity due
to the obvious correlation.
+% FIXME: explain the logarithmic claim! It's only
+% true for a certain denomination structure.
+% This denomination structure potentially introduces privacy risks
Taler solves the problem of giving change by introducing a new {\em
refresh protocol} allowing for ``divisible'' transactions with
amortized costs logarithmic in the amount of value being transacted.
@@ -243,6 +246,7 @@ disintermediated transactions.
%\subsection{Chaum-style electronic cash}
+% FIXME: what limitations? substantiate!
Chaum~\cite{chaum1983blind} proposed a digital payment system that
would provide some customer anonymity while disclosing the identity of
the merchants. DigiCash, a commercial implementation of Chaum's
@@ -287,6 +291,8 @@ to what degree the implementation is even complete. Only a partial
description of the Opencoin protocol is available to date.
% FIXME: ask OpenCoin dev's about this! Then make statement firmer!
+% FIXME: not only by brands. this formulation sounds like
+% we're unaware of the huge body of work in the area that is still growing.
Chaum's original digital cash system~\cite{chaum1983blind} was
extended by Brands~\cite{brands1993efficient} with the ability to {\em
divide} coins and thus spend certain fractions of a coin using