--- a/scripts/polynomial/polyvalm.m
+++ b/scripts/polynomial/polyvalm.m
@@ -17,22 +17,17 @@
 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 ## 02111-1307, USA.
 
-## usage: polyvalm (c, x)
-##
+## -*- texinfo -*-
+## @deftypefn {Function File} {} polyvalm (@var{c}, @var{x})
 ## Evaluate a polynomial in the matrix sense.
-##
-## In octave, a polynomial is represented by it's coefficients (arranged
-## in descending order). For example a vector c of length n+1 corresponds
-## to the following nth order polynomial
-##
-##   p(x) = c(1) x^n + ... + c(n) x + c(n+1).
-##
-## polyvalm(c,X) will evaluate the polynomial in the matrix sense, i.e. matrix
-## multiplication is used instead of element by element multiplication as is
-## used in polyval.
-##
-## X must be a square matrix.
-##
+## 
+## @code{polyvalm (@var{c}, @var{x})} will evaluate the polynomial in the
+## matrix sense, i.e. matrix multiplication is used instead of element by
+## element multiplication as is used in polyval.
+## 
+## The argument @var{x} must be a square matrix.
+## @end deftypefn
+
 ## SEE ALSO: polyval, poly, roots, conv, deconv, residue, filter,
 ##           polyderiv, polyinteg