diff --git a/syntax/asm_ca65.vim b/syntax/asm_ca65.vim
index cb7bb3c..7d984ce 100644
--- a/syntax/asm_ca65.vim
+++ b/syntax/asm_ca65.vim
@@ -73,6 +73,11 @@ syn keyword asm_ca65Mnemonic
  \ CPY DEC DEX DEY EOR INC INX INY JMP JSR LDA LDX LDY LSR NOP ORA PHA PHP PLA
  \ PLP ROL ROR RTI RTS SBC SEC SED SEI STA STX STY TAX TAY TSX TXA TXS TYA
 
+" 65816 instructions
+syn keyword asm_ca65Mnemonic
+ \ BRA BRL COP MVN MVP PEA PEI PER PHB PHD PHK PHX PHY PLB PLD PLX PLY REP RTL
+ \ SEP STP STZ TCD TCS TDC TRB TSB TSC TXY TYX WAI WDM XBA XCE BLT BGE JML JSL
+
 " 6502 illegal instruction mnemonics
 syn keyword asm_ca65MnemonicIllegal
  \ ALR ANC ARR AXS DCP ISC LAS LAX RLA RRA SAX SLO SRE