diff --git a/internals/src/error.rs b/internals/src/error.rs
index 2f213377..ff596734 100644
--- a/internals/src/error.rs
+++ b/internals/src/error.rs
@@ -1,4 +1,3 @@
-// Written by the Rust Bitcoin developers.
 // SPDX-License-Identifier: CC0-1.0
 
 //! # Error
diff --git a/internals/src/hex/buf_encoder.rs b/internals/src/hex/buf_encoder.rs
index d72cdea1..2d6793d9 100644
--- a/internals/src/hex/buf_encoder.rs
+++ b/internals/src/hex/buf_encoder.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: CC0-1.0
+
 //! Implements a buffered encoder.
 //!
 //! The main type of this module is [`BufEncoder`] which provides buffered hex encoding. Such is
diff --git a/internals/src/hex/display.rs b/internals/src/hex/display.rs
index 81450d00..6a75864a 100644
--- a/internals/src/hex/display.rs
+++ b/internals/src/hex/display.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: CC0-1.0
+
 //! Helpers for displaying bytes as hex strings.
 //!
 //! This module provides a trait for displaying things as hex as well as an implementation for
diff --git a/internals/src/hex/mod.rs b/internals/src/hex/mod.rs
index 0d55ec8e..54fd0465 100644
--- a/internals/src/hex/mod.rs
+++ b/internals/src/hex/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: CC0-1.0
+
 //! Helpers for encoding bytes as hex strings.
 
 pub mod buf_encoder;
diff --git a/internals/src/lib.rs b/internals/src/lib.rs
index 75b2ddf0..9e794aed 100644
--- a/internals/src/lib.rs
+++ b/internals/src/lib.rs
@@ -1,4 +1,3 @@
-// Written by the Rust Bitcoin developers.
 // SPDX-License-Identifier: CC0-1.0
 
 //! # Rust Bitcoin Internal
diff --git a/internals/src/macros.rs b/internals/src/macros.rs
index 2df33c92..799730f0 100644
--- a/internals/src/macros.rs
+++ b/internals/src/macros.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: CC0-1.0
+
 //! Various macros used by the Rust Bitcoin ecosystem.
 //!