[devel] Mention zlib-libpng license in each source file
diff --git a/scripts/makefile.msc b/scripts/makefile.msc
index 8bc80a1..9416c4e 100644
--- a/scripts/makefile.msc
+++ b/scripts/makefile.msc
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# Copyright (C) 2006, 2009 Glenn Randers-Pehrson
+#
+# This code is released under the zlib-libpng license.
# For conditions of distribution and use, see copyright notice in png.h
+#
# Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
# -------- Microsoft C 5.1 and later, does not use assembler code --------
