diff --git a/High_level_prototypes/asm.c b/High_level_prototypes/asm.c
index 6a90b25..f5a3e78 100644
--- a/High_level_prototypes/asm.c
+++ b/High_level_prototypes/asm.c
@@ -272,6 +272,7 @@ void assemble(struct Token* p)
 	setExpression(p, "SWAP", "090003", 4);
 	setExpression(p, "COPY", "090004", 4);
 	setExpression(p, "MOVE", "090005", 4);
+	setExpression(p, "NOT", "090006", 4);
 	setExpression(p, "BRANCH", "090100", 4);
 	setExpression(p, "CALL", "090101", 4);
 	setExpression(p, "PUSHR", "090200", 4);
diff --git a/High_level_prototypes/defs b/High_level_prototypes/defs
index ad86af6..adb6a1d 100644
--- a/High_level_prototypes/defs
+++ b/High_level_prototypes/defs
@@ -102,6 +102,7 @@ DEFINE NABS 090002
 DEFINE SWAP 090003
 DEFINE COPY 090004
 DEFINE MOVE 090005
+DEFINE NOT 090006
 DEFINE BRANCH 090100
 DEFINE CALL 090101
 DEFINE PUSHR 090200
diff --git a/High_level_prototypes/disasm.c b/High_level_prototypes/disasm.c
index 3b305e1..c2e37ce 100644
--- a/High_level_prototypes/disasm.c
+++ b/High_level_prototypes/disasm.c
@@ -542,6 +542,11 @@ void decode_Integer_2OP(struct Instruction* c)
 			strncpy(Name, "MOVE", 19);
 			break;
 		}
+		case 0x0006: /* NOT */
+		{
+			strncpy(Name, "NOT", 19);
+			break;
+		}
 		case 0x0100: /* BRANCH */
 		{
 			strncpy(Name, "BRANCH", 19);