diff --git a/Viewer-options.mediawiki b/Viewer-options.mediawiki
index f53192c..7a4965e 100644
--- a/Viewer-options.mediawiki
+++ b/Viewer-options.mediawiki
@@ -19,4 +19,5 @@ Example: http://www.example.com/pdf.js#page=2
 * textLayer: set to one of the following. Example: textLayer=off
 ** off: disable textLayer generation
 ** visible, shadow, hover: apply the CSS class <tt>textlayer-{value}</tt> to all text layers
-* pdfBug: handle PDF bugs
\ No newline at end of file
+* pdfBug: handle PDF bugs
+* useCssZoom: set to true to only use CSS zoom. Example: useCssZoom=true
\ No newline at end of file