diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83aacc5..7b179b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ target_include_directories(cosms-core PUBLIC ${PROJECT_SOURCE_DIR}/include)
 if (MSVC)
 	target_compile_options(cosms-core PRIVATE /W4)
 else()
-	target_compile_options(cosms-core PRIVATE -wall -Wextra -pedantic)
+    target_compile_options(cosms-core PRIVATE -Wall -Wextra -pedantic)
 endif()
 
 add_executable(cosms-core-test ${PROJECT_SOURCE_DIR}/tests/main.c)
diff --git a/include/cosms-core/file.h b/include/cosms-core/file.h
index d29be8b..605a29d 100644
--- a/include/cosms-core/file.h
+++ b/include/cosms-core/file.h
@@ -1,3 +1,11 @@
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
 #ifndef COSMS_CORE_FILE
 #define COSMS_CORE_FILE
 
diff --git a/src/file.c b/src/file.c
index bf321da..23b3617 100644
--- a/src/file.c
+++ b/src/file.c
@@ -1,4 +1,12 @@
-#include <cosms-core/file.h>
+/*
+ * Copyright (C) Tristan Franssen, <tristanfranssen@strawhats.nl>.
+ *
+ * This software is licensed under the Apache License, Version 2.0 (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License in the file LICENSE or at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
+#include "cosms-core/file.h"
 
 #include <stdio.h>