diff --git a/doc/acknowledgements.qbk b/doc/acknowledgements.qbk
index 1387cc5..07e010a 100644
--- a/doc/acknowledgements.qbk
+++ b/doc/acknowledgements.qbk
@@ -9,7 +9,7 @@
 
 I'd like to thank Alex Hagen-Zanker, Christopher Kormanyos, Conrad Poelman,
 Eugene Yakubovich, Giovanni Piero Deretta, Hartmut Kaiser, Jeffrey Lee Hellrung,
-Nat Goodspeed, Robert Stewart, Vicente J. Botet Escriba and Yuriy Krasnoschek.
+[*Nat Goodspeed], Robert Stewart, Vicente J. Botet Escriba and Yuriy Krasnoschek.
 
 Especially Eugene Yakubovich, Giovanni Piero Deretta and Vicente J. Botet
 Escriba contributed many good ideas during the review.