diff --git a/lib/std/crypto/aegis.zig b/lib/std/crypto/aegis.zig
index f91c13a06..f3060ef61 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 ee8880438..e57decb2b 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 64d205955..179d90449 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 7ac360363..c62583a93 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 a07539bad..60a29fd19 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 d08878e85..bea4af751 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 5ba2bb3c1..52c337209 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 b8689b799..70e1e190b 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 adc6c87c1..769b7e614 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 337a6aa30..7252000f2 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 {