diff --git a/book.pdf b/book.pdf
deleted file mode 100644
index 34067a3..0000000
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diff --git a/chapter02.tex b/chapter02.tex
index e1e81af..5e33945 100644
--- a/chapter02.tex
+++ b/chapter02.tex
@@ -457,8 +457,8 @@ After this change, the time complexity is $O(n^2)$.
 
 Surprisingly, it is possible to solve the problem
 in $O(n)$ time\footnote{In \cite{ben86}, this linear-time algorithm
-is attributed to J. B. Kadene, and the algorithm is sometimes
-called \index{Kadene's algorithm} \key{Kadene's algorithm}.}, which means
+is attributed to J. B. Kadane, and the algorithm is sometimes
+called \index{Kadane's algorithm} \key{Kadane's algorithm}.}, which means
 that just one loop is enough.
 The idea is to calculate, for each array position,
 the maximum sum of a subarray that ends at that position.
diff --git a/preface.tex b/preface.tex
index 5c455a2..ebd743b 100644
--- a/preface.tex
+++ b/preface.tex
@@ -28,6 +28,6 @@ You can always send feedback on the book to
 \texttt{ahslaaks@cs.helsinki.fi}.
 
 \begin{flushright}
-Helsinki, June 2017 \\
+Helsinki, July 2017 \\
 Antti Laaksonen
 \end{flushright}