add missing '
diff --git a/Doc/lib/liblogging.tex b/Doc/lib/liblogging.tex
index 9d81db2..1c39824 100644
--- a/Doc/lib/liblogging.tex
+++ b/Doc/lib/liblogging.tex
@@ -842,7 +842,7 @@
Returns a new instance of the \class{Formatter} class. The
instance is initialized with a format string for the message as a whole,
as well as a format string for the date/time portion of a message. If
-no \var{fmt} is specified, \code{\%(message)s'} is used. If no \var{datefmt}
+no \var{fmt} is specified, \code{'\%(message)s'} is used. If no \var{datefmt}
is specified, the ISO8601 date format is used.
\end{classdesc}