diff --git a/lib/std/crypto/aegis.zig b/lib/std/crypto/aegis.zig
index f91c13a06c717d7969211fee7cdf8b4ad9f73577..f3060ef615866032bb33e643dee4027bc0f7ef5a 100644
--- a/lib/std/crypto/aegis.zig
+++ b/lib/std/crypto/aegis.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("std");
 const mem = std.mem;
 const assert = std.debug.assert;
diff --git a/lib/std/crypto/aes_gcm.zig b/lib/std/crypto/aes_gcm.zig
index ee8880438896f9840e3573c78812e7449de93684..e57decb2b2f3f9ce6548eafb25a035bd363a43bb 100644
--- a/lib/std/crypto/aes_gcm.zig
+++ b/lib/std/crypto/aes_gcm.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("std");
 const assert = std.debug.assert;
 const builtin = std.builtin;
diff --git a/lib/std/crypto/bcrypt.zig b/lib/std/crypto/bcrypt.zig
index 64d20595596ace6974e39ea83822de756f8e0ef2..179d904494a080ff3e56e17c334501da3422c0c4 100644
--- a/lib/std/crypto/bcrypt.zig
+++ b/lib/std/crypto/bcrypt.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("std");
 const crypto = std.crypto;
 const fmt = std.fmt;
diff --git a/lib/std/crypto/hkdf.zig b/lib/std/crypto/hkdf.zig
index 7ac360363725be1bdb50f366ea3f79c515b5b374..c62583a932f3144cb06d007552ae7846be57e26e 100644
--- a/lib/std/crypto/hkdf.zig
+++ b/lib/std/crypto/hkdf.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const hmac = std.crypto.auth.hmac;
diff --git a/lib/std/crypto/salsa20.zig b/lib/std/crypto/salsa20.zig
index a07539bad5050fb06e8aaa5fe0832981502fc468..60a29fd19cec80f34364ed395814c0185a49130f 100644
--- a/lib/std/crypto/salsa20.zig
+++ b/lib/std/crypto/salsa20.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("std");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/io/auto_indenting_stream.zig b/lib/std/io/auto_indenting_stream.zig
index d08878e8516ffc83c16262d99c980b2780e16472..bea4af7519c8c02de35e9786bc0762d23c3f9bf6 100644
--- a/lib/std/io/auto_indenting_stream.zig
+++ b/lib/std/io/auto_indenting_stream.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/change_detection_stream.zig b/lib/std/io/change_detection_stream.zig
index 5ba2bb3c103b4b74a3719ef2671b76e3d6b620f9..52c3372094390c199de0fbf3ad2e5321e6aeb190 100644
--- a/lib/std/io/change_detection_stream.zig
+++ b/lib/std/io/change_detection_stream.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/find_byte_out_stream.zig b/lib/std/io/find_byte_out_stream.zig
index b8689b7992747213628643cf3434cdae3725f608..70e1e190b117461ee172ecb9834a8945cf2f2819 100644
--- a/lib/std/io/find_byte_out_stream.zig
+++ b/lib/std/io/find_byte_out_stream.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/os/bits/linux/powerpc64.zig b/lib/std/os/bits/linux/powerpc64.zig
index adc6c87c1a78e8996fdc9b2b3fab80e0673a4756..769b7e614d4f777eb0bae2820d73d237f3325413 100644
--- a/lib/std/os/bits/linux/powerpc64.zig
+++ b/lib/std/os/bits/linux/powerpc64.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/linux/powerpc64.zig b/lib/std/os/linux/powerpc64.zig
index 337a6aa30ae08abfb27094091eb2338b5a103dd6..7252000f24599c8c79b9c8f7b867b20dcfda3bf9 100644
--- a/lib/std/os/linux/powerpc64.zig
+++ b/lib/std/os/linux/powerpc64.zig
@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
+
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {