diff --git a/thesis.tex b/thesis.tex
index 3cf31be..5b2f9ff 100644
--- a/thesis.tex
+++ b/thesis.tex
@@ -299,7 +299,7 @@
 %% Acknowledgements
 \begin{acknowledgements}
   Firstly, I want to thank Sam Lindley for his guidance, advice, and
-  encouragement throughout my studies. He has been enthusiastic
+  encouragement throughout my studies. He has been an enthusiastic
   supervisor, and he has always been generous with his time. I am
   fortunate to have been supervised by him.
   %