diff --git a/ReBarDxe/ReBar.c b/ReBarDxe/ReBar.c
index ed7e08f..4122db6 100644
--- a/ReBarDxe/ReBar.c
+++ b/ReBarDxe/ReBar.c
@@ -1,3 +1,7 @@
+/*
+Copyright (c) 2022 xCuri0 <zkqri0@gmail.com>
+SPDX-License-Identifier: MIT
+*/
 #include <Uefi.h>
 #include <Library/UefiLib.h>
 #include <Library/UefiBootServicesTableLib.h>
@@ -32,6 +36,7 @@ static EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *pciRootBridgeIo;
 
 static EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL_PREPROCESS_CONTROLLER o_PreprocessController;
 
+// find last set bit and return the index of it
 INTN fls(UINT32 x)
 {
     UINT32 r;
@@ -39,6 +44,7 @@ INTN fls(UINT32 x)
     #ifdef _MSC_VER
     _BitScanReverse64(&r, x);
     #else
+    // taken from linux x86 bitops.h
     asm("bsrl %1,%0"
 	    : "=r" (r)
 	    : "rm" (x), "0" (-1));
diff --git a/ReBarDxe/buildffs.py b/ReBarDxe/buildffs.py
index cf8e053..acfda70 100755
--- a/ReBarDxe/buildffs.py
+++ b/ReBarDxe/buildffs.py
@@ -1,4 +1,8 @@
 #!/usr/bin/env python3
+#
+# Copyright (c) 2022 xCuri0 <zkqri0@gmail.com>
+# SPDX-License-Identifier: MIT
+#
 import os
 import sys
 import glob
diff --git a/ReBarState/ReBarState.cpp b/ReBarState/ReBarState.cpp
index 3423076..51a72ac 100644
--- a/ReBarState/ReBarState.cpp
+++ b/ReBarState/ReBarState.cpp
@@ -1,4 +1,8 @@
-#include <iostream>
+/*
+Copyright (c) 2022 xCuri0 <zkqri0@gmail.com>
+SPDX-License-Identifier: MIT
+*/
+#include <iostream>
 #include <string>
 #include <cmath>