diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..4dccb4a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Marek Kraus <gamelaster@outlook.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE. 
\ No newline at end of file
diff --git a/include/blisp.h b/include/blisp.h
index 60a4e92..eaa8ddd 100644
--- a/include/blisp.h
+++ b/include/blisp.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #ifndef _LIBBLISP_H
 #define _LIBBLISP_H
 
diff --git a/include/blisp_chip.h b/include/blisp_chip.h
index c3d44f1..d3ff789 100644
--- a/include/blisp_chip.h
+++ b/include/blisp_chip.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #ifndef _BLISP_CHIP_H
 #define _BLISP_CHIP_H
 
diff --git a/include/blisp_util.h b/include/blisp_util.h
index cac10a6..dd7bbcb 100644
--- a/include/blisp_util.h
+++ b/include/blisp_util.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #ifndef _BLISP_UTIL_H
 #define _BLISP_UTIL_H
 
diff --git a/lib/blisp.c b/lib/blisp.c
index f3d94c6..ef9faa0 100644
--- a/lib/blisp.c
+++ b/lib/blisp.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include <blisp.h>
 #include <blisp_util.h>
 #include <libserialport.h>
diff --git a/lib/chip/blisp_chip_bl60x.c b/lib/chip/blisp_chip_bl60x.c
index 7b5c59e..f9cc5be 100644
--- a/lib/chip/blisp_chip_bl60x.c
+++ b/lib/chip/blisp_chip_bl60x.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "blisp.h"
 
 struct blisp_chip blisp_chip_bl60x = {
diff --git a/lib/chip/blisp_chip_bl70x.c b/lib/chip/blisp_chip_bl70x.c
index 19058d5..805481a 100644
--- a/lib/chip/blisp_chip_bl70x.c
+++ b/lib/chip/blisp_chip_bl70x.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "blisp.h"
 
 struct blisp_chip blisp_chip_bl70x = {
diff --git a/tools/blisp/src/cmd.h b/tools/blisp/src/cmd.h
index 9c971d8..20af7b4 100644
--- a/tools/blisp/src/cmd.h
+++ b/tools/blisp/src/cmd.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #ifndef BLISP_CMD_H
 #define BLISP_CMD_H
 
diff --git a/tools/blisp/src/cmd/write.c b/tools/blisp/src/cmd/write.c
index c940831..5c44453 100644
--- a/tools/blisp/src/cmd/write.c
+++ b/tools/blisp/src/cmd/write.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "../cmd.h"
 #include "argtable3.h"
 #include <blisp.h>
diff --git a/tools/blisp/src/main.c b/tools/blisp/src/main.c
index dad13f5..87ae4ac 100644
--- a/tools/blisp/src/main.c
+++ b/tools/blisp/src/main.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 #include "argtable3.h"
 #include "cmd.h"
 #include <stdbool.h>