\begin{methoddesc}{first}{}
Set the cursor to the first item in the DB file and return it. The order of
-keys in the file is unspecified.
+keys in the file is unspecified, except in the case of B-Tree databases.
\end{methoddesc}
\begin{methoddesc}{next}{}
Set the cursor to the next item in the DB file and return it. The order of
-keys in the file is unspecified.
+keys in the file is unspecified, except in the case of B-Tree databases.
\end{methoddesc}
\begin{methoddesc}{previous}{}
Set the cursor to the first item in the DB file and return it. The
-order of keys in the file is unspecified. This is not supported on
-hashtable databases (those opened with \function{hashopen()}).
+order of keys in the file is unspecified, except in the case of B-Tree
+databases. This is not supported on hashtable databases (those opened
+with \function{hashopen()}).
\end{methoddesc}
\begin{methoddesc}{last}{}