diff --git a/Instruction-Set.md b/Instruction-Set.md
index 0177bc3..728646d 100644
--- a/Instruction-Set.md
+++ b/Instruction-Set.md
@@ -202,6 +202,7 @@ The carry flag (CF) is set equal to the last bit shifted out of the left end.
 #### Pseudo code
 ```py
 destination = destination << count
+#NOTE: be aware of the difference between a logical and an arithmetic shift
 ```
 
 ### SHR
@@ -221,6 +222,7 @@ destination = destination << count
 #### Pseudo code
 ```py
 destination = destination >> count
+#NOTE: be aware of the difference between a logical and an arithmetic shift
 ```
 
 ### HWI
@@ -827,7 +829,7 @@ if count == 1:
 | mnemonic | opcode | operands | carry | zero | sign | overflow | break |
 | -------- | ------ | -------- | ----- | ---- | ---- | -------- | ----- |
 | `RCR destination, count`    | `0x28` |  `destination` : `mem` / `reg` |  `X`  |  `-` |  `-` |    `X`   |  `-`  |
-| | |  `count` : `mem` / `reg`, `imm` |
+| | |  `count` : `mem` / `reg` / `imm` |
 
 #### Description
 `RCR` shifts the bits of the `destination` operand to the right by the
@@ -867,6 +869,27 @@ if count == 1:
     OVERFLOW_FLAG = (old_sign_bit != new_sign_bit)
 ```
 
+### SAR
+#### Details
+| mnemonic | opcode | operands | carry | zero | sign | overflow | break |
+| -------- | ------ | -------- | ----- | ---- | ---- | -------- | ----- |
+| `SAR destination, count` | `0x29` |  `destination` : `mem` / `reg` | `X` | `X` | `X` | `X` | `-` |
+| | |  `count` : `mem` / `reg`/ `imm` |
+#### Description
+The `SAR` (Shift Arithmetic Right) instruction shifts the bits of the destination operand downward (toward the least significant bit) by the number of bit positions specified in the second operand (count).
+As bits are transferred out of the right (low-order) end of the destination, bits equal to the original sign bit are shifted into the left (high-order) end, thereby preserving the sign bit. The carry flag (CF) is set equal to the last bit shifted out of the right end.
+
+If the count operand is not an immediate 1, the overflow flag (OF) is undefined; otherwise SAR resets OF to zero.
+> TODO: Not sure if this part is implemented, should check source code
+
+> TODO: Plain english? (now copy pasta from the [manual](http://www.ousob.com/ng/iapx86/ng215f0.php))
+
+### Pseudo code
+```py
+destination = destination <<< count
+#NOTE: be aware of the difference between a logical and an arithmetic shift
+```
+
 ### INC
 #### Details
 | mnemonic | opcode | operands | carry | zero | sign | overflow | break |
@@ -879,6 +902,7 @@ if count == 1:
 ```py
 destination = destination + 1
 ```
+
 ### DEC
 #### Details
 | mnemonic | opcode | operands | carry | zero | sign | overflow | break |