diff --git a/gen/gen_code.cpp b/gen/gen_code.cpp
index c978bd5..d8c8ebc 100644
--- a/gen/gen_code.cpp
+++ b/gen/gen_code.cpp
@@ -543,6 +543,7 @@ void put()
 			{ 3, "t2", 0x18},
 			{ 0, "nta", 0x18},
 			{ 2, "wt1", 0x0D},
+			{ 1, "w", 0x0D},
 		};
 		for (size_t i = 0; i < NUM_OF_ARRAY(tbl); i++) {
 			const Tbl *p = &tbl[i];
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index dba60ec..c19f7f7 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -591,6 +591,7 @@ void prefetchnta(const Address& addr) { opModM(addr, Reg32(0), 0x0F, 0x18); }
 void prefetcht0(const Address& addr) { opModM(addr, Reg32(1), 0x0F, 0x18); }
 void prefetcht1(const Address& addr) { opModM(addr, Reg32(2), 0x0F, 0x18); }
 void prefetcht2(const Address& addr) { opModM(addr, Reg32(3), 0x0F, 0x18); }
+void prefetchw(const Address& addr) { opModM(addr, Reg32(1), 0x0F, 0x0D); }
 void prefetchwt1(const Address& addr) { opModM(addr, Reg32(2), 0x0F, 0x0D); }
 void psadbw(const Mmx& mmx, const Operand& op) { opMMX(mmx, op, 0xF6); }
 void pshufb(const Mmx& mmx, const Operand& op) { opMMX(mmx, op, 0x00, 0x66, NONE, 0x38); }