diff --git a/doc/HACKS b/doc/HACKS
index a465ec98bb48..a49fd82ecdec 100644
--- a/doc/HACKS
+++ b/doc/HACKS
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.118 2011/10/27 18:46:43 christos Exp $
+# $NetBSD: HACKS,v 1.119 2011/10/29 15:18:21 christos Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -679,3 +679,15 @@ port	powerpc64
 		    libposix_pic.a(cerror.pico)(.text+0x14): unresolvable \
 		    R_PPC64_REL24 relocation against symbol `.__errno'
 	kcah
+
+	hack	rename data() function in mdocml to avoid redefined error.
+		Compiler/Assembler bug?
+	cdate	Sat Oct 29 11:16:01 EDT 2011
+	who	christos
+	file	src/external/bsd/mdocml/tbl_data.c: 1.2
+	descr
+		workaround for:
+		    {standard input}: Assembler messages:
+		    {standard input}:105: Error: symbol `.data' is already \
+		    defined
+	kcah