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diff --git a/lib/libc/include/aarch64-macos-gnu/os/workgroup_parallel.h b/lib/libc/include/aarch64-macos-gnu/os/workgroup_parallel.h
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+++ b/lib/libc/include/aarch64-macos-gnu/os/workgroup_parallel.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2020 Apple Inc. All rights reserved.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_START@
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_END@
+ */
+
+#ifndef __OS_WORKGROUP_PARALLEL__
+#define __OS_WORKGROUP_PARALLEL__
+
+#ifndef __OS_WORKGROUP_INDIRECT__
+#error "Please #include <os/workgroup.h> instead of this file directly."
+#include <os/workgroup_base.h> // For header doc
+#endif
+
+#include <os/workgroup_object.h>
+
+__BEGIN_DECLS
+
+OS_WORKGROUP_ASSUME_NONNULL_BEGIN
+
+/*!
+ * @typedef os_workgroup_parallel_t
+ *
+ * @abstract
+ * A subclass of an os_workgroup_t for tracking parallel work.
+ */
+OS_WORKGROUP_SUBCLASS_DECL_PROTO(os_workgroup_parallel, Parallelizable);
+OS_WORKGROUP_SUBCLASS_DECL(os_workgroup_parallel, os_workgroup, WorkGroupParallel);
+
+/*!
+ * @function os_workgroup_parallel_create
+ *
+ * @abstract
+ * Creates an os_workgroup_t which tracks a parallel workload.
+ * A newly created os_workgroup_interval_t has no initial member threads -
+ * in particular the creating thread does not join the os_workgroup_parallel_t
+ * implicitly.
+ *
+ * See also os_workgroup_max_parallel_threads().
+ *
+ * @param name
+ * A client specified string for labelling the workgroup. This parameter is
+ * optional and can be NULL.
+ *
+ * @param attr
+ * The requested set of workgroup attributes. NULL is to be specified for the
+ * default set of attributes.
+ */
+API_AVAILABLE(macos(11.0), ios(14.0), tvos(14.0), watchos(7.0))
+OS_WORKGROUP_EXPORT OS_WORKGROUP_RETURNS_RETAINED
+OS_SWIFT_NAME(WorkGroupParallel.init(__name:attr:))
+os_workgroup_parallel_t _Nullable
+os_workgroup_parallel_create(const char * _Nullable name,
+	os_workgroup_attr_t _Nullable attr);
+
+OS_WORKGROUP_ASSUME_NONNULL_END
+
+__END_DECLS
+
+#endif /* __OS_WORKGROUP_PARALLEL__ */
+\ No newline at end of file