diff --git a/insns.dat b/insns.dat
index f95b157e..61af07f5 100644
--- a/insns.dat
+++ b/insns.dat
@@ -768,6 +768,9 @@ NEG       rm16                \320\300\1\xF7\203            8086
 NEG       rm32                \321\300\1\xF7\203            386
 NEG       rm64                \324\300\1\xF7\203            X64
 NOP       void                \1\x90                        8086
+NOP	  rm16                \320\300\2\x0F\x1F\200        P6
+NOP	  rm32                \321\300\2\x0F\x1F\200        P6
+NOP	  rm64                \324\300\2\x0F\x1F\200        X64
 NOT       rm8                 \300\1\xF6\202                8086
 NOT       rm16                \320\300\1\xF7\202            8086
 NOT       rm32                \321\300\1\xF7\202            386