diff --git a/spec/zoneddatetime.html b/spec/zoneddatetime.html
index 8b56575294..68d8003772 100644
--- a/spec/zoneddatetime.html
+++ b/spec/zoneddatetime.html
@@ -1394,7 +1394,7 @@ <h1>
           _roundingIncrement_: a positive integer,
           _smallestUnit_: a String,
           _roundingMode_: a String,
-        ): either a normal completion containing a Record with fields [[DurationRecord]] (a Duration Record) and [[Total]] (a mathematical value), or a throw completion
+        ): either a normal completion containing a Record with fields [[DurationRecord]] (a Duration Record) and [[Total]] (a mathematical value or ~unset~), or a throw completion
       </h1>
       <dl class="header">
         <dt>description</dt>