diff --git a/Viewer-options.mediawiki b/Viewer-options.mediawiki
index 350498b..7cc2f3c 100644
--- a/Viewer-options.mediawiki
+++ b/Viewer-options.mediawiki
@@ -20,4 +20,5 @@ Example: http://www.example.com/pdf.js#page=2
 ** off: disable textLayer generation
 ** visible, shadow, hover: apply the CSS class <tt>textlayer-{value}</tt> to all text layers
 * pdfBug: enable debugging tools, see [https://github.com/mozilla/pdf.js/wiki/Debugging-pdf.js].
-* useOnlyCssZoom: set to true to use only CSS zoom. Example: useOnlyCssZoom=true
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+* useOnlyCssZoom: set to true to use only CSS zoom. Example: useOnlyCssZoom=true
+* verbosity: specify the verbosity of console messages. 0 = only errors, 1 = warnings and errors, 5 = warnings, errors and information messages. Example: verbosity=5
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