diff --git a/x86/md5-compress.asm b/x86/md5-compress.asm
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+C nettle, low-level cryptographics library
+C 
+C Copyright (C) 2005, Niels Möller
+C  
+C The nettle library is free software; you can redistribute it and/or modify
+C it under the terms of the GNU Lesser General Public License as published by
+C the Free Software Foundation; either version 2.1 of the License, or (at your
+C option) any later version.
+C 
+C The nettle library is distributed in the hope that it will be useful, but
+C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+C or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+C License for more details.
+C 
+C You should have received a copy of the GNU Lesser General Public License
+C along with the nettle library; see the file COPYING.LIB.  If not, write to
+C the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+C MA 02111-1307, USA.
+
+C Register usage
+define(<SA>,<%eax>)
+define(<SB>,<%ebx>)
+define(<SC>,<%ecx>)
+define(<SD>,<%edx>)
+
+define(<DATA>,<%esp>)
+
+C %ebp, %edi and %esi available for temporaries
+