diff --git a/.astylerc b/.astylerc
index 9d55efe..a278bc2 100644
--- a/.astylerc
+++ b/.astylerc
@@ -1,12 +1,12 @@
---style=google 
+--style=google
 --indent=spaces
 --indent-preproc-define
 --indent-preproc-cond
---pad-oper 
---pad-comma 
+--pad-oper
+--pad-comma
 --pad-header
---align-pointer=name 
---add-braces 
+--align-pointer=name
+--add-braces
 --convert-tabs
---mode=c 
---suffix=none
\ No newline at end of file
+--mode=c
+--suffix=none
diff --git a/dev-support/README.md b/dev-support/README.md
index 6ba908f..84ebf9d 100644
--- a/dev-support/README.md
+++ b/dev-support/README.md
@@ -1,3 +1,5 @@
+[//]: # (SPDX-License-Identifier: CC-BY-4.0)
+
 # Dev Support
 
 ## Recommended Prerequisites
diff --git a/dev-support/bin/log b/dev-support/bin/log
index 07c0525..6f487aa 100644
--- a/dev-support/bin/log
+++ b/dev-support/bin/log
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: Apache-2.0
 
 RED="$(tput setaf 1)"
 GREEN="$(tput setaf 2)"
diff --git a/dev-support/bin/style b/dev-support/bin/style
index 08745da..97b5532 100755
--- a/dev-support/bin/style
+++ b/dev-support/bin/style
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: Apache-2.0
 
 set -o errexit
 set -o errtrace
diff --git a/flake.nix b/flake.nix
index 30cc977..ec576a8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 {
   description = "mlkem-c-embedded";