diff --git a/fullscreen.bs b/fullscreen.bs
index e98c7f4..4ffb252 100644
--- a/fullscreen.bs
+++ b/fullscreen.bs
@@ -168,6 +168,7 @@ enum FullscreenNavigationUI {
 
 dictionary FullscreenOptions {
   FullscreenNavigationUI navigationUI = "auto";
+  OrientationLockType orientation;
 };
 
 partial interface Element {
@@ -206,6 +207,11 @@ partial interface mixin DocumentOrShadowRoot {
   free to honor user preference over the application's. The default value
   "{{FullscreenNavigationUI/auto}}" indicates no application preference.
 
+  When supplied, <var>options</var>'s {{FullscreenOptions/orientation}} member indicates whether
+  the screen should be locked to the given [=screen orientation=]. User agents are always
+  free to honor user preference over the application's. When the value is missing,
+  no orientation lock is applied.
+
  <dt><code><var>document</var> . {{Document/fullscreenEnabled}}</code>
  <dd><p>Returns true if <var>document</var> has the ability to display <a>elements</a> fullscreen
  and <a>fullscreen is supported</a>, or false otherwise.
@@ -269,10 +275,7 @@ are:
  <li><p>Return <var>promise</var>, and run the remaining steps <a>in parallel</a>.
 
  <li>
-  <p>If <var>error</var> is false, then resize <var>pendingDoc</var>'s <a>node navigable</a>'s
-  <a for=navigable>top-level traversable</a>'s <a for=navigable>active document</a>'s viewport's
-  dimensions, optionally taking into account
-  <var>options</var>["{{FullscreenOptions/navigationUI}}"]:
+  <var>options</var>["{{FullscreenOptions/orientation}}"] and <var>options</var>["{{FullscreenOptions/navigationUI}}"]:
   <!-- cross-process -->
 
   <table>