diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index ebf79ddd9..01e881d83 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,7 @@
+1999-11-18  Gavin Romig-Koch  <gavin@cygnus.com>
+
+	* mips.h (INSN_ISA5): New.
+
 1999-11-01  Gavin Romig-Koch  <gavin@cygnus.com>
 
 	* mips.h (OPCODE_IS_MEMBER): New.
diff --git a/include/opcode/mips.h b/include/opcode/mips.h
index 07e0fd7c6..8c93d1bd7 100644
--- a/include/opcode/mips.h
+++ b/include/opcode/mips.h
@@ -308,6 +308,7 @@ struct mips_opcode
 #define INSN_ISA3		    0x00000003
 /* MIPS ISA 4 instruction (R8000).  */
 #define INSN_ISA4		    0x00000004
+#define INSN_ISA5		    0x00000005
 
 /* Chip specific instructions.  These are bitmasks.  */
 /* MIPS R4650 instruction.  */