diff --git a/SConstruct b/SConstruct
index d7284684..3630625a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -152,7 +152,11 @@ if 'NSIS_CONFIG_CONST_DATA_PATH' in defenv['NSIS_CPPDEFINES']:
 
 # write configuration into sconf.h and defines.h
 sconf_h = open(File('#Source/exehead/sconf.h').abspath, 'w')
+sconf_h.write('// This file is automatically generated by SCons\n// DO NOT EDIT THIS FILE\n')
+
 defines_h = open(File('#Source/defines.h').abspath, 'w')
+defines_h.write('// This file is automatically generated by SCons\n// DO NOT EDIT THIS FILE\n')
+
 for i in defenv['NSIS_CPPDEFINES']:
 	if type(i) is not str:
 		sconf_h.write('#define %s %s\n' % (i[0], i[1]))
@@ -168,6 +172,7 @@ defines_h.close()
 
 # write version into version.h
 f = open(File('#Source/version.h').abspath, 'w')
+f.write('// This file is automatically generated by SCons\n// DO NOT EDIT THIS FILE\n')
 f.write('#define NSIS_VERSION "v%s"\n' % defenv['VERSION'])
 f.close()