diff --git a/doc/design-paper/challenges.tex b/doc/design-paper/challenges.tex
index f0c07fe4fc..953b622910 100644
--- a/doc/design-paper/challenges.tex
+++ b/doc/design-paper/challenges.tex
@@ -962,6 +962,8 @@ other candidate helpers.
 \subsection{Location-hidden services}
 \label{subsec:hidden-services}
 
+% This section is first up against the wall when the revolution comes.
+
 Tor's \emph{rendezvous points}
 let users provide TCP services to other Tor users without revealing
 the service's location. Since this feature is relatively recent, we describe