1 files changed, 47 insertions, 1 deletions
diff --git a/help/en_US/zplane.xml b/help/en_US/zplane.xml
index 64a7172..57b9d40 100644
--- a/help/en_US/zplane.xml
+++ b/help/en_US/zplane.xml
@@ -17,7 +17,53 @@
 
   <refnamediv>
     <refname>zplane</refname>
-    <refpurpose>funcprot(0);</refpurpose>
+    <refpurpose>Pole-Zero plot for Discrete time systems</refpurpose>
+    <para> </para>
   </refnamediv>
 
+
+<refsynopsisdiv>
+   <title>Calling Sequence</title>
+   <synopsis>
+zplane(z);
+zplane(z,p);
+   </synopsis>
+   <para> </para>
+</refsynopsisdiv>
+
+<refsection>
+   <title>Description</title>
+   <para>
+This function gives pole zero plote of discrete time systems
+   </para>
+   <para> </para>
+</refsection>
+
+<refsection>
+   <title>Parameters</title>
+   <variablelist>
+   <varlistentry><term>z</term>
+      <listitem><para> : vector containing numerator coefficients</para></listitem></varlistentry>
+   <varlistentry><term>p</term>
+      <listitem><para> : vector containing denumerator coefficients</para></listitem></varlistentry>
+   </variablelist>
+   <para> </para>
+</refsection>
+
+<refsection>
+   <title>Examples</title>
+   <programlisting role="example"><![CDATA[
+z = [1 2 3];
+p = [4 5 6];
+zplane(z,p);
+   ]]></programlisting>
+
+<scilab:image>
+z = [1 2 3];
+p = [4 5 6];
+zplane(z,p);
+</scilab:image>
+
+</refsection>
+
 </refentry>