--- a/+grid/Curvilinear.m	Tue Sep 06 17:28:11 2016 +0200
+++ b/+grid/Curvilinear.m	Wed Sep 07 10:13:26 2016 +0200
@@ -7,7 +7,8 @@
     methods
         % Creates a curvilinear grid.
         % Ex: grid.Curvilinear(mapping, xi, eta, ...)
-        %    mapping     -- either a matrix or a cell array with physical coordinates.
+        %    mapping     -- either a function handle, a matrix or a cell array with physical coordinates.
+        %                   A function handle should be a vector valued function of the coordinate mapping.
         %                   A matrix should be a grid function (N*D x 1 vector) or a N x D
         %                   A cell array should be a 1 x D cell array with either N x 1 vectors
         %                   or matrices of the same dimesions as the logical grid.