add descriptions of exported data attributes
diff --git a/Doc/lib/libcalendar.tex b/Doc/lib/libcalendar.tex
index 8a00280..bf3a7d6 100644
--- a/Doc/lib/libcalendar.tex
+++ b/Doc/lib/libcalendar.tex
@@ -112,6 +112,31 @@
\versionadded{2.0}
\end{funcdesc}
+The \module{calendar} module exports the following data attributes:
+
+\begin{datadesc}{day_name}
+An array that represents the days of the week in the
+current locale.
+\end{datadesc}
+
+\begin{datadesc}{day_abbr}
+An array that represents the abbreviated days of the week
+in the current locale.
+\end{datadesc}
+
+\begin{datadesc}{month_name}
+An array that represents the months of the year in the
+current locale. This follows normal convention
+of January being month number 1, so it has a length of 13 and
+\code{month_name[0]} is the empty string.
+\end{datadesc}
+
+\begin{datadesc}{month_abbr}
+An array that represents the abbreviated months of the year
+in the current locale. This follows normal convention
+of January being month number 1, so it has a length of 13 and
+\code{month_abbr[0]} is the empty string.
+\end{datadesc}
\begin{seealso}
\seemodule{datetime}{Object-oriented interface to dates and times