diff --git a/definition.md b/definition.md
index 8b52784..f22cb69 100644
--- a/definition.md
+++ b/definition.md
@@ -142,3 +142,8 @@ Operands add up to 32bits
 |IOLI     |0x51    |REG IOA                     |Read value of IOA onto REG                        |
 |IOW      |0x52    |REG_A REG_B SIM             |Write A into IO pin B offset by SIM               |
 |IOR      |0x53    |REG_A REG_B SIM             |Read IO pin B offset by SIM into IO A             |
+## Controll
+|NAME     |Code    |Operands                    |Function                                          |
+|---------|--------|----------------------------|--------------------------------------------------|
+|HALT     |0xf0    |REG_A                       |Halt excecution hold last 6 bits of A on LEDs     |
+|HALI     |0xf1    |IMM                         |Halt excecution hold last 6 bits of IMM on LEDs   |