diff --git a/doc/spec/proposals/121-hidden-service-authentication.txt b/doc/spec/proposals/121-hidden-service-authentication.txt
index 93ab74263d..89f6d2649e 100644
--- a/doc/spec/proposals/121-hidden-service-authentication.txt
+++ b/doc/spec/proposals/121-hidden-service-authentication.txt
@@ -83,7 +83,7 @@ Motivation:
 
   (2) Better protection of service location: Unauthorized clients could not
   force Bob to create circuits to their rendezvous points, thus preventing
-  the attack described by Øverlier and Syverson in their paper "Locating
+  the attack described by Øverlier and Syverson in their paper "Locating
   Hidden Servers" even without the need for guards.
 
   (3) Hiding activity: Apart from performing the actual authorization, a