1.1 --- a/lemon/lgf_reader.h	Wed Jul 09 07:57:53 2008 +0200
     1.2 +++ b/lemon/lgf_reader.h	Thu Jul 10 15:02:35 2008 +0200
     1.3 @@ -1226,6 +1226,12 @@
     1.4    /// It can be used almost the same way as \c DigraphReader.
     1.5    /// The only difference is that this class can handle edges and
     1.6    /// edge maps as well as arcs and arc maps.
     1.7 +  ///
     1.8 +  /// The columns in the \c \@edges (or \c \@arcs) section are the
     1.9 +  /// edge maps. However, if there are two maps with the same name
    1.10 +  /// prefixed with \c '+' and \c '-', then these can be read into an
    1.11 +  /// arc map.  Similarly, an attribute can be read into an arc, if
    1.12 +  /// it's value is an edge label prefixed with \c '+' or \c '-'.
    1.13    template <typename _Graph>
    1.14    class GraphReader {
    1.15    public: