diff --git a/js/src/jscntxt.cpp b/js/src/jscntxt.cpp
index 6715a548a20..e4fc1b8553f 100644
--- a/js/src/jscntxt.cpp
+++ b/js/src/jscntxt.cpp
@@ -2033,9 +2033,8 @@ error:
 
 /*
  * Since this function is only called in the context of a pending exception,
- * the caller must subsequently take an error path. If wrapping fails, we leave
- * the exception cleared, which, in the context of an error path, will be
- * interpreted as an uncatchable exception.
+ * the caller must subsequently take an error path. If wrapping fails, it will
+ * set a new (uncatchable) exception to be used in place of the original.
  */
 void
 JSContext::wrapPendingException()