Add punctuation

diff --git a/9.1/paper.tex b/9.1/paper.tex
index 32aac36ce6cc671ffaab2a7171abcced2a71c407..6c2d12651d20e269a508857dfba5b95e24ae9a9a 100644 (file)
--- a/9.1/paper.tex
+++ b/9.1/paper.tex
@@ -161,7 +161,7 @@
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 \section{Overview}
 
-\dealii version 9.1.0 was released May 21, 2019
+\dealii version 9.1.0 was released May 21, 2019.
 This paper provides an
 overview of the new features of this major release and serves as a citable
 reference for the \dealii software library version 9.1. \dealii is an