diff --git a/lib/lzma/7zTypes.h b/lib/lzma/7zTypes.h
index 18c804cf3b2..89f40f2a66e 100644
--- a/lib/lzma/7zTypes.h
+++ b/lib/lzma/7zTypes.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LZMA-SDK-9.22 */
 /* 7zTypes.h -- Basic types
 2024-01-24 : Igor Pavlov : Public domain */
 
diff --git a/lib/lzma/Compiler.h b/lib/lzma/Compiler.h
index ee9afcee4df..b1d682e19aa 100644
--- a/lib/lzma/Compiler.h
+++ b/lib/lzma/Compiler.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LZMA-SDK-9.22 */
 /* Compiler.h : Compiler specific defines and pragmas
 : Igor Pavlov : Public domain */
 
diff --git a/lib/lzma/LzmaDec.c b/lib/lzma/LzmaDec.c
index 9cbe36af718..f509afcf31f 100644
--- a/lib/lzma/LzmaDec.c
+++ b/lib/lzma/LzmaDec.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: LZMA-SDK-9.22
 /* LzmaDec.c -- LZMA Decoder
 2023-04-07 : Igor Pavlov : Public domain */
 
diff --git a/lib/lzma/LzmaDec.h b/lib/lzma/LzmaDec.h
index 9e0ef3ef583..6f1207488b2 100644
--- a/lib/lzma/LzmaDec.h
+++ b/lib/lzma/LzmaDec.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LZMA-SDK-9.22 */
 /* LzmaDec.h -- LZMA Decoder
 2023-04-02 : Igor Pavlov : Public domain */
 
diff --git a/lib/lzma/Precomp.h b/lib/lzma/Precomp.h
index 38f3d1eb6fd..bcdf3d57b6c 100644
--- a/lib/lzma/Precomp.h
+++ b/lib/lzma/Precomp.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LZMA-SDK-9.22 */
 /* Precomp.h -- precompilation file
 2024-01-25 : Igor Pavlov : Public domain */