diff --git a/README.rst b/README.rst
index 2c0ea2f..7adc76c 100644
--- a/README.rst
+++ b/README.rst
@@ -15,26 +15,27 @@ Pin Layout
 
 The following table shows the typical pin layout used:
 
-+-----------+---------+-----------------------------+
-|           | PCD     | Arduino                     |
-|           +---------+---------+---------+---------+
-|           | MFRC522 | Uno     | Mega    | Nano v3 |
-+-----------+---------+---------+---------+---------+
-| Signal    | Pin     | Pin     | Pin     | Pin     |
-+===========+=========+=========+=========+=========+
-| RST/Reset | RST     | 9 [1]_  | 5 [1]_  | D9      |
-+-----------+---------+---------+---------+---------+
-| SPI SS    | SDA     | 10 [2]_ | 53 [2]_ | D10     |
-+-----------+---------+---------+---------+---------+
-| SPI MOSI  | MOSI    | 11      | 52      | D11     |
-+-----------+---------+---------+---------+---------+
-| SPI MISO  | MISO    | 12      | 51      | D12     |
-+-----------+---------+---------+---------+---------+
-| SPI SCK   | SCK     | 13      | 50      | D13     |
-+-----------+---------+---------+---------+---------+
++-----------+----------+---------------------------------+
+|           | PCD      | Arduino                         |
+|           +----------+-------------+---------+---------+
+|           | MFRC522  | Uno         | Mega    | Nano v3 |
++-----------+----------+-------------+---------+---------+
+| Signal    | Pin      | Pin         | Pin     | Pin     |
++===========+==========+=============+=========+=========+
+| RST/Reset | RST      | 9 [1]_      | 5 [1]_  | D9      |
++-----------+----------+-------------+---------+---------+
+| SPI SS    | SDA [3]_ | 10 [2]_     | 53 [2]_ | D10     |
++-----------+----------+-------------+---------+---------+
+| SPI MOSI  | MOSI     | 11 / ICSP-4 | 52      | D11     |
++-----------+----------+-------------+---------+---------+
+| SPI MISO  | MISO     | 12 / ICSP-1 | 51      | D12     |
++-----------+----------+-------------+---------+---------+
+| SPI SCK   | SCK      | 13 / ICSP-3 | 50      | D13     |
++-----------+----------+-------------+---------+---------+
 
-.. [1] Configurable, typically defined as RST_PIN in Sketch.
-.. [2] Configurable, typically defined as SS_PIN in Sketch.
+.. [1] Configurable, typically defined as RST_PIN in sketch/program.
+.. [2] Configurable, typically defined as SS_PIN in sketch/program.
+.. [3] The SDA pin might be labeled SS on some/older MFRC522 boards. 
 
 
 Hardware