diff --git a/contracts/bytecode.md b/contracts/bytecode.md
index 4090a1c..b8ccd0a 100644
--- a/contracts/bytecode.md
+++ b/contracts/bytecode.md
@@ -7,37 +7,46 @@ XXXX XXXXXXXX  XXXXXXXX  XXXXXXXX  ... XXXXXXXX  10101010
 CMD  PARAMREF0 PARAMREF1 PARAMREF2 ... PARAMREFN PARAMEND
 ```
 
-| Command      | Code | Param0    | Param1 | Param2 | Param3 | Param4 |
-|--------------|------|-----------|--------|--------|--------|--------|
-| Exit         | 00   | Status    |
-| ExitBfr      | 01   | StatusBfr |
-| InitBfr      | 02   | Loc       | ResDst |
-| CpyBfr       | 03   | Src       | Dst    | ResDst |
-| FreeBfr      | 04   | Loc       | ResDst |
-| BfrStat      | 05   | Loc       | StaDst |
-| Add          | 06   | A         | B      | Out    | ResDst |
-| Sub          | 07   | A         | B      | Out    | ResDst |
-| Mul          | 08   | A         | B      | Out    | ResDst |
-| Div          | 09   | A         | B      | Out    | ResDst |
-| And          | 0A   | A         | B      | Out    | ResDst |
-| Or           | 0B   | A         | B      | Out    | ResDst |
-| Not          | 0C   | A         | ResDst |
-| App          | 0D   | A         | B      | Out    | ResDst |
-| Slice        | 0E   | In        | S      | E      | Out    | ResDst |
-| Shiftl       | 0F   | In        | Bits   | Out    | ResDst |
-| Shiftr       | 10   | In        | Bits   | Out    | ResDst |
-| Eq           | 11   | A         | B      | Out    | ResDst |
-| Jmp          | 12   | Loc       | ResDst |
-| JmpCond      | 13   | Loc       | Cond   | ResDst |
-| Stdout       | 14   | Bfr       | ResDst |
-| Stderr       | 15   | Bfr       | ResDst |
-| SetCnst      | 16   | Bfr       | Val    | ResDst |
-| Tx           | 17   | Sndr      | Recvr  | Amount | ResDst |
-| GetNthBlk    | 18   | N         | Prop   | Out    | ResDst |
-| GetNthTx     | 19   | BlkN      | TxN    | Prop   | Out    | ResDst |
-| ChainLen     | 1A   | Out       |
-| UpdateState  | 1B   | Location  | Value  | ResDst |
-| GetFromState | 1C   | Location  | Dst    | ResDst |
+| Command                | Code | Param0    | Param1 | Param2 | Param3 | Param4 |
+|------------------------|------|-----------|--------|--------|--------|--------|
+| Exit                   | 00   | Status    |
+| ExitBfr                | 01   | StatusBfr |
+| InitBfr                | 02   | Loc       | ResDst |
+| CpyBfr                 | 03   | Src       | Dst    | ResDst |
+| FreeBfr                | 04   | Loc       | ResDst |
+| BfrStat                | 05   | Loc       | StaDst |
+| Add                    | 06   | A         | B      | Out    | ResDst |
+| Sub                    | 07   | A         | B      | Out    | ResDst |
+| Mul                    | 08   | A         | B      | Out    | ResDst |
+| Div                    | 09   | A         | B      | Out    | ResDst |
+| And                    | 0A   | A         | B      | Out    | ResDst |
+| Or                     | 0B   | A         | B      | Out    | ResDst |
+| Not                    | 0C   | A         | ResDst |
+| App                    | 0D   | A         | B      | Out    | ResDst |
+| Slice                  | 0E   | In        | S      | E      | Out    | ResDst |
+| Shiftl                 | 0F   | In        | Bits   | Out    | ResDst |
+| Shiftr                 | 10   | In        | Bits   | Out    | ResDst |
+| Eq                     | 11   | A         | B      | Out    | ResDst |
+| Jmp                    | 12   | Loc       | ResDst |
+| JmpCond                | 13   | Loc       | Cond   | ResDst |
+| Stdout                 | 14   | Bfr       | ResDst |
+| Stderr                 | 15   | Bfr       | ResDst |
+| SetCnst                | 16   | Bfr       | Val    | ResDst |
+| Tx                     | 17   | Sndr      | Recvr  | Amount | ResDst |
+| GetNthBlk              | 18   | N         | Prop   | Out    | ResDst |
+| GetNthTx               | 19   | BlkN      | TxN    | Prop   | Out    | ResDst |
+| ChainLen               | 1A   | Out       |
+| UpdateState            | 1B   | Location  | Value  | ResDst |
+| GetFromState           | 1C   | Location  | Dst    | ResDst |
+| BfrLen                 | 1D   | Location  | Dst    | ResDst |
+| Exp                    | 1E   | A         | B      | Out    | ResDst |
+| Mod                    | 1F   | A         | B      | Out    | ResDst |
+| Less                   | 20   | A         | B      | Out    | ResDst |
+| Call                   | 21   | Line      |
+| Ret                    | 22   |
+| PrintStr               | 23   | StrBfr    | ResDst |
+| UpdateStateExternal    | 24   | Location  | Data   |
+| GetFromStateWithPrefix | 25   | Location  | Out    | ResDst |
 
 `0x00000000` is a pre-initialized buffer. It is used for capturing global errors.