diff --git a/Instruction-Set.md b/Instruction-Set.md
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 ### Instruction encoding
 Instructions are 1-3 words long and are fully defined by the first word.
 In a basic instruction, the lower 6 bits of the first word of the instruction
-are the opcode, and the remaining 12 bits are split into a 5 bit destination operand
+are the opcode, and the remaining 10 bits are split into a 5 bit destination operand
 and a 5 bit source operand.
 In bits, a basic instruction has the format: `sssssdddddoooooo`