diff --git a/index.bs b/index.bs
index 3e6f4a6e..6fcceefc 100644
--- a/index.bs
+++ b/index.bs
@@ -2737,13 +2737,15 @@ PDF document represented as a Base64-encoded string.
         params: browsingContext.PrintParameters
       }
 
+      browsingContext.PageRange = text .regexp "^(?:[0-9]+)?(?:-(?:[0-9]+)?)?$"
+
       browsingContext.PrintParameters = {
         context: browsingContext.BrowsingContext,
         ? background: bool .default false,
         ? margin: browsingContext.PrintMarginParameters,
         ? orientation: ("portrait" / "landscape") .default "portrait",
         ? page: browsingContext.PrintPageParameters,
-        ? pageRanges: [*(js-uint / text)],
+        ? pageRanges: [*(js-uint / browsingContext.PageRange )],
         ? scale: (0.1..2.0) .default 1.0,
         ? shrinkToFit: bool .default true,
       }