diff --git a/NOTICE.txt b/NOTICE.txt
index 9b5b734..6f183f8 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -3,3 +3,11 @@
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
+
+====================
+
+The files in the package org.apache.commons.compress.archivers.sevenz
+were derived from the LZMA SDK, version 9.20 (C/ and CPP/7zip/),
+which has been placed in the public domain:
+
+"LZMA SDK is placed in the public domain." (http://www.7-zip.org/sdk.html)