diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index f3c4332..26ca8cc 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 name: Lint Check (pre-commit)
 
 on:
diff --git a/.markdownlint.yaml b/.markdownlint.yaml
index 81f5fcd..24f7550 100644
--- a/.markdownlint.yaml
+++ b/.markdownlint.yaml
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 # MD033/no-inline-html : Inline HTML : https://github.com/DavidAnson/markdownlint/blob/v0.35.0/doc/md033.md
 # Disable inline html linter is needed for <details> <summary>
 MD033: false
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d19c5e6..6f7601e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
diff --git a/cmake/beman.bounds_test-config.cmake b/cmake/beman.bounds_test-config.cmake
index 47222e3..72ff433 100644
--- a/cmake/beman.bounds_test-config.cmake
+++ b/cmake/beman.bounds_test-config.cmake
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 include(${CMAKE_CURRENT_LIST_DIR}/beman.bounds_test-targets.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/check_plat.cmake)
 
diff --git a/cmake/bootstrap_vcpkg.cmake b/cmake/bootstrap_vcpkg.cmake
index fd61f30..2593993 100644
--- a/cmake/bootstrap_vcpkg.cmake
+++ b/cmake/bootstrap_vcpkg.cmake
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 option(BEMAN_BOUNDS_TEST_BOOTSTRAP_VCPKG "Bootstrap vcpkg if no other toolchain exists" OFF)
 
 if(BEMAN_BOUNDS_TEST_BOOTSTRAP_VCPKG AND NOT DEFINED CMAKE_TOOLCHAIN_FILE)
diff --git a/cmake/check_plat.cmake b/cmake/check_plat.cmake
index 3656c43..f650def 100644
--- a/cmake/check_plat.cmake
+++ b/cmake/check_plat.cmake
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 function(check_plat HAS_GNU_VAR HAS_MSVC_VAR)
   include(CheckSourceCompiles)
   set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
diff --git a/include/beman/bounds_test/plat/CMakeLists.txt b/include/beman/bounds_test/plat/CMakeLists.txt
index 44311a2..5bf4ec0 100644
--- a/include/beman/bounds_test/plat/CMakeLists.txt
+++ b/include/beman/bounds_test/plat/CMakeLists.txt
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 check_plat(HAS_GNU_OVERFLOW HAS_MSVC_OVERFLOW)
 
 if(HAS_GNU_OVERFLOW)