diff --git a/src/arch/i386.ins b/src/arch/i386.ins
index c27a0e8..d059dde 100644
--- a/src/arch/i386.ins
+++ b/src/arch/i386.ins
@@ -588,6 +588,16 @@
 { "fwait",	0x9b,		OP1F, AOT_NONE,   AOT_NONE,  AOT_NONE	},
 /* NOP		0x90		1					*/
 { "nop",	0x90,		OP1F, AOT_NONE,   AOT_NONE,  AOT_NONE	},
+/* NOT		0xf6 /2		1     r/m8				*/
+{ "notb",	0xf6,		OP1F, OP_RM8_D0+2,AOT_NONE,  AOT_NONE	},
+{ "notb",	0xf6,		OP1F, OP_RM8_D8+2,AOT_NONE,  AOT_NONE	},
+{ "notb",	0xf6,		OP1F, OP_RM8_DW+2,AOT_NONE,  AOT_NONE	},
+{ "not",	0xf6,		OP1F, OP_RM8_R8+2,AOT_NONE,  AOT_NONE	},
+/* NOT		0xf7 /2		1     r/mW				*/
+{ "not",	0xf7,		OP1F, OP_RMW_D0+2,AOT_NONE,  AOT_NONE	},
+{ "not",	0xf7,		OP1F, OP_RMW_D8+2,AOT_NONE,  AOT_NONE	},
+{ "not",	0xf7,		OP1F, OP_RMW_DW+2,AOT_NONE,  AOT_NONE	},
+{ "not",	0xf7,		OP1F, OP_RMW_RW+2,AOT_NONE,  AOT_NONE	},
 /* OR		0x0c ib		1     al          imm8			*/
 { "or",		0x0c,		OP1F, OP_al,	  OP_S8,     AOT_NONE	},
 /* OR		0x0d iW		1     AX          immW			*/
diff --git a/test/i386.S b/test/i386.S
index 33ac3a3..b6cf5d3 100644
--- a/test/i386.S
+++ b/test/i386.S
@@ -241,6 +241,14 @@
 	fninit
 	fwait
 	nop					/* 90			*/
+	notb	[%eax]
+	notb	[%eax + $0x42]
+	notb	[%eax + $0x11223344]
+	not	%ch
+	not	[%eax]
+	not	[%eax + $0x42]
+	not	[%eax + $0x11223344]
+	not	%eax
 	/* OR */
 	or	[%ecx], %dh
 	or	[%ecx+$0x50], %dh