diff --git a/features/iterator-join.yml b/features/iterator-join.yml
new file mode 100644
index 00000000000..359efc3b980
--- /dev/null
+++ b/features/iterator-join.yml
@@ -0,0 +1,3 @@
+name: Iterator join
+description: "The `Iterator.prototype.join()` method concatenates all values from an iterator into a string without needing to materialize them into an array first."
+spec: https://github.com/tc39/proposal-iterator-join
diff --git a/features/iterator-join.yml.dist b/features/iterator-join.yml.dist
new file mode 100644
index 00000000000..ba377815fea
--- /dev/null
+++ b/features/iterator-join.yml.dist
@@ -0,0 +1,6 @@
+# Generated from: iterator-join.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}
diff --git a/scripts/specs.ts b/scripts/specs.ts
index 3a6b638e69e..97d1b24016f 100644
--- a/scripts/specs.ts
+++ b/scripts/specs.ts
@@ -243,6 +243,10 @@ const defaultAllowlist: allowlistItem[] = [
     [
         "https://github.com/whatwg/html/pull/9546",
         "Allowed because the <input type=\"checkbox\" switch> feature is not yet in a formal spec. Remove this exception when a formal spec is available."
+    ],
+    [
+        "https://github.com/tc39/proposal-iterator-join",
+        "Allowed because the iterator-join proposal is not yet part of ecma262."
     ]
 ];