diff --git a/src/future/FutureIterator.php b/src/future/FutureIterator.php
--- a/src/future/FutureIterator.php
+++ b/src/future/FutureIterator.php
@@ -194,7 +194,7 @@
    * @task iterator
    */
   public function next() {
-    // See T13572. If we preivously resolved and returned a Future, release
+    // See T13572. If we previously resolved and returned a Future, release
     // it now. This prevents us from holding Futures indefinitely when callers
     // like FuturePool build long-lived iterators and keep adding new Futures
     // to them.