Created xml help files

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diff --git a/macros/czt.sci b/macros/czt.sci
index b027489..84a0253 100644
--- a/macros/czt.sci
+++ b/macros/czt.sci
@@ -1,4 +1,23 @@
 function y = czt(x, varargin)
+//Chirp Z Transform
+//Calling Sequence
+//czt (x)
+//czt (x, m)
+//czt (x, m, w)
+//czt (x, m, w, a)
+//Parameters 
+//x: Input scalar or vector
+//m: Total Number of steps
+//w: ratio between points in each step
+//a: point in the complex plane 
+//Description
+//This is an Octave function.
+//Chirp z-transform. Compute the frequency response starting at a and stepping by w for m steps. a is a point in the complex plane, and w is the ratio between points in each step (i.e., radius increases exponentially, and angle increases linearly).
+//Examples
+// m = 32;                               ## number of points desired
+// w = exp(-j*2*pi*(f2-f1)/((m-1)*Fs));  ## freq. step of f2-f1/m
+// a = exp(j*2*pi*f1/Fs);                ## starting at frequency f1
+// y = czt(x, m, w, a);
 
 funcprot(0);
 lhs= argn(1);