diff --git a/heliosmatics.html b/heliosmatics.html
index b6ec2a4..6c92f70 100644
--- a/heliosmatics.html
+++ b/heliosmatics.html
@@ -410,7 +410,8 @@ The calculation only give &theta;<sub>CM</sub> after the bending.
 <hr>
 <p></p>
 HELIOSmatics was first built by Ben P. Kay in MS Excel around 2010. It was modified by Ryan Tang later. And now it migrated to the web on Dec, 2022.
-
+<br>
+The calculation can be found in the source code (heliosmatics.js or press F12)
 
 <!--
 <hr>
diff --git a/heliosmatics.js b/heliosmatics.js
index 1b1f543..7f8faae 100644
--- a/heliosmatics.js
+++ b/heliosmatics.js
@@ -250,7 +250,7 @@ function SetSSType(){
     perpDistant = 20;
     detGap = 5;
     detLen = 100;
-    nDet = 4;
+    nDet = 5;
   }
   arrayLen = detLen * nDet + detGap * (nDet-1);
   
@@ -936,6 +936,7 @@ window.checkSSType = function(){
   SetSSType();
   CalculateEZ();
   CalThetaCM();
+  CalculateRZ();
 }
 
 var FuncCheckSSType = window.checkSSType.bind(null, "SSType");
diff --git a/index.html b/index.html
index 6d435f1..db9f0fd 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html>
 <head>
   <title>SOLARIS Si-Array Mode Simulation </title>
+  <meta name="description" content="SOLARIS Si-Array mode simulation. This is ported from the original Heliosmatics in MS excel, Monte Carlo simulation using CERN ROOT, and DWBA simulation using the Peolemy.">
   <link rel="icon" type="image/x-icon" href="SOLARIS_favicon.png">
 </head>
 <meta charset="utf-8">
diff --git a/instruction.html b/instruction.html
index 5c5ba10..6dae52c 100644
--- a/instruction.html
+++ b/instruction.html
@@ -38,6 +38,8 @@
 </p>
 
 <hr>
+<h1>Credits:</h1>
+
 <h4>This page is created and hosted by Fox's Lab (FSU) in collabortion with SOLARIS (FRIB).</h4>
 <h4>The SOLARIS project is based on HELIOS (ANL) and is leaded by ANL.</h4>
 <h4>The ISS (ISOLDE Solenoidal Spectrometer) is located as CERN.</h4>
@@ -51,6 +53,13 @@
 <a href="https://isolde-solenoidal-spectrometer.web.cern.ch/" target="_blank"><img src="ISS_logo.png"></a>
 <a href="https://www.anl.gov/phy/helical-orbit-spectrometer" target="_blank"><img src="HELIOS_logo.jpg"></a>
 
+<p></p>
+The simulation was started from Ben Kay (ANL) around 2010 using excel spreadsheet. 
+<br>
+Ryan Tang (former ANL postdoc, now at FSU) developed a Monte Carlo simulation with DWBA using CERN ROOT framework. 
+<br>
+And the whole simulation migrated to here at Dec, 2022.
+
 <p></p>
 Contact: Ryan Tang (rtang at fsu.edu) 
 <p> any suggestions and feedback are very welcome.</p>
diff --git a/simpleSim.html b/simpleSim.html
index 1979ec3..aae1bc0 100644
--- a/simpleSim.html
+++ b/simpleSim.html
@@ -234,6 +234,8 @@
   <li>To change DWBA angular range, download the in file, edit it. But becareful, DWBA for kinematic simulation must be 0 -180 deg.</li>
 </ul>
 
+<hr style="height:4px;background-color:#F7CF3C; border-style:none; border-width:none">
+The source code for calculation can be found in <a href="https://github.com/calemhoffman/digios/tree/master/analysis/Cleopatra/Transfer.C" target="_blank">Here</a>
 
 </body>
 
