diff --git a/lua-mpack.spec b/lua-mpack.spec
index 5aa27b2..0cdf747 100644
--- a/lua-mpack.spec
+++ b/lua-mpack.spec
@@ -24,11 +24,11 @@ Summary:        Implementation of MessagePack for Lua 5.1
 License:        MIT
 Group:          Development/Libraries/Other
 Url:            https://github.com/libmpack/libmpack-lua
-# Building against system version is in works of upstream Master branch
 Source:         https://github.com/libmpack/libmpack-lua/archive/%{version}.tar.gz
-# libmpack source is necessary to build lua51-mpack.
+# libmpack source is necessary to build lua-mpack, next release should build
+# fine against system version
 # The latest source can be downloaded from: https://github.com/libmpack/libmpack
-Source1:        https://github.com/libmpack/libmpack/archive/%{version}/libmpack-%{libmpack_version}.tar.gz
+Source1:        https://github.com/libmpack/libmpack/archive/%{libmpack_version}/libmpack-%{libmpack_version}.tar.gz
 # PATCH-FIX-UPSTREAM lua51-mpack-fix-gcc7.patch gh#libmpack/libmpack-lua#3 -- Fix compilation error when using GCC7.
 Patch0:         lua51-mpack-fix-gcc7.patch
 # PATCH-FIX-UPSTREAM lua51-mpack-fix-compilation.patch gh#libmpack/libmpack-lua#2 -- Fix compilation error when using `USE_SYSTEM_LUA=1`.