diff --git a/articles/ui/ui.tex b/articles/ui/ui.tex
index 77c64ad59..943264a98 100644
--- a/articles/ui/ui.tex
+++ b/articles/ui/ui.tex
@@ -204,7 +204,7 @@ Before we look at the payment workflow for Taler, we sketch the
 workflow of existing payment systems. This establishes a common
 terminology which we will use to compare different payment processes.
 We include interaction diagrams for some of the payment systems
-based on resources from the W3c payment interest group.
+based on resources from the W3C payment interest group.
 
 \subsection{Cash}
 
@@ -258,7 +258,7 @@ issued by the customer's bank.
 \begin{center}
 \includegraphics[width=0.95\textwidth]{figs/cc3ds.pdf}
 \end{center}
-\caption{Card payment processing with 3DS. (From: W3c Web Payments IG.)}
+\caption{Card payment processing with 3DS. (From: W3C Web Payments IG.)}
 \label{fig:cc3ds}
 \end{figure*}
 
@@ -282,7 +282,7 @@ customer's bank, often on a Web site that is operated by the payment
 processor and {\em not} the customer's bank.  Figure~\ref{fig:cc3ds}
 % FIXME why "..on the Web today using.." and not just "..on the Web using.."
 shows a typical card-based payment process on the Web today using the
-UML style of the W3c payment interest group~\cite{pigs}.  Most of the details
+UML style of the W3C payment interest group~\cite{pigs}.  Most of the details
 are not relevant to this paper, but the diagram nicely illustrates the
 complexity of the common 3-D secure (3DS) process.
 
@@ -345,7 +345,7 @@ online shopping~\cite[p. 50]{ibi2014}.
 
 \begin{figure*}[b!]
 \includegraphics[width=\textwidth]{figs/bitcoin.pdf}
-\caption{Bitcoin payment processing. (From: W3c Web Payments IG.)}
+\caption{Bitcoin payment processing. (From: W3C Web Payments IG.)}
 \label{fig:bitcoin}
 \end{figure*}
 
@@ -422,7 +422,7 @@ the development of new protocols with better privacy protections.
 
 \begin{figure*}[t!]
 \includegraphics[width=\textwidth]{figs/paypal.pdf}
-\caption{Payment processing with Paypal. (From: W3c Web Payments IG.)}
+\caption{Payment processing with Paypal. (From: W3C Web Payments IG.)}
 \label{fig:paypal}
 \end{figure*}