diff --git a/faq/admin-right-needed-to-install.md b/faq/admin-right-needed-to-install.md
index 5dd5373b..fed978ff 100644
--- a/faq/admin-right-needed-to-install.md
+++ b/faq/admin-right-needed-to-install.md
@@ -14,8 +14,8 @@ https://www.dynamsoft.com/web-twain/docs/faq/#project-deployment-and-end-user-in
 
 # Are admin rights required to install the end-user component?
 
-Yes, the Dynamsoft Service installer is a `.msi` file which requires administrator rights. If your organization does not allow end users to have admin rights, you can contact [Dynamsoft Support]({{site.about}}getsupport.html) to get a special "Personal Installer" that does not require admin rights.
+Yes, the Dynamsoft Service installer is a `.msi` file which requires administrator rights to install as the install target is `C:\Windows\SysWOW64\`. Once the Dynamsoft Service is installed with admin rights, every user on that machine can has access to the Dynamsoft Service. 
 
-> NOTE
->
-> Once the Dynamsoft Service is installed with admin rights, every user on that machine can use it. On the other hand, if it is installed with a "Personal Installer", only that specific user can use it.
+If your organization does not allow end users to have admin rights, you can contact [Dynamsoft Support]({{site.about}}getsupport.html) to get a special "Personal Installer" that does not require admin rights.
+
+The "Personal Installer", will install to the user's `C:\Users\{UserName}\AppData\Roaming\` folder. Please be aware that only one user per machine is able to have the service installed via this method. The service cannot be installed to multiple user profiles, and only the user that installs the Services in this manner will have access to the Dynamsoft Service.
diff --git a/info/api/WebTwain_Viewer.md b/info/api/WebTwain_Viewer.md
index 24c8e79f..732e672f 100644
--- a/info/api/WebTwain_Viewer.md
+++ b/info/api/WebTwain_Viewer.md
@@ -1135,6 +1135,30 @@ setButtonClass(
 
 `className`: Specify the CSS class name.
 
+**Availability**
+
+<div class="availability">
+<table>
+
+<tr>
+<td align="center">ActiveX</td>
+<td align="center">H5(Windows)</td>
+<td align="center">H5(macOS/TWAIN)</td>
+<td align="center">H5(macOS/ICA)</td>
+<td align="center">H5(Linux)</td>
+</tr>
+
+<tr>
+<td align="center">not supported </td>
+<td align="center">v16.0+ </td>
+<td align="center">v16.0+ </td>
+<td align="center">v16.0+ </td>
+<td align="center">v16.0+ </td>
+</tr>
+
+</table>
+</div>
+
 **Usage notes**
 
 Use this method to fine-tune the buttons in the viewer with CSS.