diff --git a/6502asm.JSON-tmLanguage b/6502asm.JSON-tmLanguage
index 52ea3f5..3f68d34 100644
--- a/6502asm.JSON-tmLanguage
+++ b/6502asm.JSON-tmLanguage
@@ -5,7 +5,7 @@
     "patterns": [
  
         {
-            "match": "(?i)\\b(adc|and|asl|dec|dex|dey|eor|inc|inx|iny|lsr|ora|rol|ror|sbc)\\b",
+            "match": "(?i)\\b(adc|and|asl|dec|dex|dey|eor|inc|inx|iny|lsr|ora|rol|ror|sbc|nop)\\b",
             "name": "keyword.arithlogic.asm",
             "comment": "Arithmetic and logic instructions"
         },
diff --git a/6502asm.tmLanguage b/6502asm.tmLanguage
index 2a7718a..b4a9ca9 100644
--- a/6502asm.tmLanguage
+++ b/6502asm.tmLanguage
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
 	<key>fileTypes</key>
@@ -14,7 +14,7 @@
 			<key>comment</key>
 			<string>Arithmetic and logic instructions</string>
 			<key>match</key>
-			<string>(?i)\b(adc|and|asl|dec|dex|dey|eor|inc|inx|iny|lsr|ora|rol|ror|sbc)\b</string>
+			<string>(?i)\b(adc|and|asl|dec|dex|dey|eor|inc|inx|iny|lsr|ora|rol|ror|sbc|nop)\b</string>
 			<key>name</key>
 			<string>keyword.arithlogic.asm</string>
 		</dict>