diff --git a/Doc/libtime.tex b/Doc/libtime.tex
index fe8b7dc..7e83f4e 100644
--- a/Doc/libtime.tex
+++ b/Doc/libtime.tex
@@ -10,7 +10,7 @@
 \begin{itemize}
 
 \item
-The ``epoch'' is the point where the time starts.  On January 1st that
+The ``epoch'' is the point where the time starts.  On January 1st of that
 year, at 0 hours, the ``time since the epoch'' is zero.  For UNIX, the
 epoch is 1970.  To find out what the epoch is, look at the first
 element of \code{gmtime(0)}.