diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index d9dad0a990..f1e568016f 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,5 +1,7 @@
 Mon Dec 16 13:00:15 1996  Jeffrey A Law  (law@cygnus.com)
 
+	* mn10300-opc.c (mn10300_opcodes): Add "break" instruction.
+
 	* mn10200-opc.c: Add pseudo-ops for "mov (an),am" and "mov an,(am)".
 
 Sat Dec 14 22:36:20 1996  Ian Lance Taylor  <ian@cygnus.com>
diff --git a/opcodes/mn10300-opc.c b/opcodes/mn10300-opc.c
index 806f97cc89..906f8a4332 100644
--- a/opcodes/mn10300-opc.c
+++ b/opcodes/mn10300-opc.c
@@ -492,6 +492,14 @@ const struct mn10300_opcode mn10300_opcodes[] = {
 { "sat16",	0xf640,		0xfff0,		FMT_D0, {DM1, DN0}},
 { "sat24",	0xf650,		0xfff0,		FMT_D0, {DM1, DN0}},
 { "bsch",	0xf670,		0xfff0,		FMT_D0, {DM1, DN0}},
+
+/* Extension.  When talking to the simulator, gdb requires some instruction
+   that will trigger a "breakpoint" (really just an instruction that isn't
+   otherwise used by the tools.  This instruction must be the same size
+   as the smallest instruction on the target machine.  In the case of the
+   mn10x00 the "break" instruction must be one byte.  0xff is available on
+   both mn10x00 architectures.  */
+{ "break",	0xff,		0xff,		FMT_S0, {UNUSED}},
 { 0, 0, 0, 0, {0}},
 
 } ;