diff --git a/HACKING b/HACKING
index 581a5c8765..f8f6caafd2 100644
--- a/HACKING
+++ b/HACKING
@@ -25,7 +25,7 @@ Third-party Code and License Overview
 * util/lzma/C/*: Dual-licensed, LGPL + Common Public License (CPL). There's
   a special exception, please see util/lzma/C/7zip/Decompress/LzmaDecode.c.
   Source: LZMA SDK, http://sourceforge.net/projects/sevenzip/
-  Current version we use: lzma442.tar.bz2 (05/2006)
+  Current version we use: LZMA SDK 4.42 (05/2006)
 
 * util/lzma/minilzma.cc: ?
   Source: ?
@@ -41,3 +41,8 @@ Third-party Code and License Overview
   cvs -d:pserver:anoncvs@sources.redhat.com:/cvs/glibc co libc/elf/elf.h
   Current version we use: ?
 
+* lib/lzmadecode.[ch]: Dual-licensed, LGPL + Common Public License (CPL).
+  There's a special exception, please see lib/lzmadecode.[ch].
+  Source: LZMA SDK, http://sourceforge.net/projects/sevenzip/
+  Current version we use: LZMA SDK 4.40 (05/2006)
+