--- a/scripts/general/curl.m
+++ b/scripts/general/curl.m
@@ -76,12 +76,12 @@
     
   if ((nargin == 4) || (nargin == 2))
     if (!size_equal (varargin{fidx}, varargin{fidx + 1}))
-      error ("curl: size of x and y must match.");
+      error ("curl: size of X and Y must match.");
     elseif (ndims (varargin{fidx}) != 2)
-      error ("curl: expected two-dimensional matrices x and y.");
+      error ("curl: expected two-dimensional matrices X and Y.");
     elseif ((length (dx) != columns (varargin{fidx}))
          || (length (dy) != rows (varargin{fidx})))
-      error ("curl: size of dx and dy must match the respective dimension of x and y");
+      error ("curl: size of dx and dy must match the respective dimension of X and Y");
     endif
 
     dFx_dy = gradient (varargin{fidx}.', dy, dx).';
@@ -101,13 +101,13 @@
 
   elseif ((nargin == 6) || (nargin == 3))
     if (!size_equal (varargin{fidx}, varargin{fidx + 1}, varargin{fidx + 2}))
-      error ("curl: size of x, y, and z must match")
+      error ("curl: size of X, Y, and Z must match")
     elseif (ndims (varargin{fidx}) != 3)
-      error ("curl: expected two-dimensional matrices x, y, and z.");
+      error ("curl: expected two-dimensional matrices X, Y, and Z.");
     elseif ((length (dx) != size (varargin{fidx}, 2))
          || (length (dy) != size (varargin{fidx}, 1))
          || (length (dz) != size (varargin{fidx}, 3)))
-      error ("curl: size of dx, dy, and dz must match the respective dimesion of x, y, and z.");
+      error ("curl: size of dx, dy, and dz must match the respective dimesion of X, Y, and Z.");
     endif
 
     [~, dFx_dy, dFx_dz] = gradient (varargin{fidx}, dx, dy, dz);